Issue:
feat(verify): add new types for validate API

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [x] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates

## Description
This part of series of PR's which are aimed at adding ValidateAPI in the core. This PR specifically deals with introducing new types for the Flows and Operations which are to be added going further.
<!-- Describe your changes in detail -->


### Additional Changes

- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!-- 
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
Here, the intension is adding a new Validation feature in PaymentsCore, for that reason following are the steps that the change is broken down to. 
1. Create new types for the change
2. Introduce the Flow and Connector Integration
3. Add Stripe POC
4. Move the mandate related behaviour to domain
5. Introduce the new operation and all the related components in the payments core
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless its an obvious bug or documentation fix
that will have little conversation).
-->


## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->


## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Resolution:
<think>
PR Context:
- Title: feat(stripe): add setup intent in connector integration (stripe)
- Merged: 2022-12-07T06:29:41Z
- Files changed: 15 files
- Commits: 10 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [x] Enhancement
- [ ] Refactoring
- [ ] Dependency updates

## Description
This PR adds a stripe POC for the verify API
<!-- Describe your changes in detail -->


### Additional Changes

- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!-- 
Provide links to the files with corresponding changes.

Following are the 
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** feat(stripe): add setup intent in connector integration (stripe) (#50)
Co-authored-by: Arun Raj M <j
Files to modify:


**crates/router/src/compatibility/stripe/errors.rs**
  Modify existing code

**crates/router/src/connector/aci.rs**
  Add:
    - impl: impl api::PreVerify for Aci
    - impl: impl services::ConnectorIntegration<
        api::Verify,
        types::VerifyRequestData,
        types::PaymentsResponseData,
    > for Aci

**crates/router/src/connector/adyen.rs**
  Add:
    - impl: impl api::PreVerify for Adyen
    - impl: impl services::ConnectorIntegration<
        api::Verify,
        types::VerifyRequestData,
        types::PaymentsResponseData,
    > for Adyen

**crates/router/src/connector/authorizedotnet.rs**
  Add:
    - impl: impl api::PreVerify for Authorizedotnet
    - impl: impl services::ConnectorIntegration<
        api::Verify,
        types::VerifyRequestData,
        types::PaymentsResponseData,
    > for Authorizedotnet

**crates/router/src/connector/braintree.rs**
  Add:
    - impl: impl api::PreVerify for Braintree
    - impl: impl services::ConnectorIntegration<
        api::Verify,
        types::VerifyRequestData,
        types::PaymentsResponseData,
    > for Braintree

**crates/router/src/connector/checkout.rs**
  Add:
    - impl: impl api::PreVerify for Checkout
    - impl: impl services::ConnectorIntegration<
        api::Verify,
        types::VerifyRequestData,
        types::PaymentsResponseData,
    > for Checkout

**crates/router/src/connector/stripe.rs**
  Add:
    - function: private::get_headers
    - function: private::get_content_type
    - function: private::get_url
    - function: private::get_request_body
    - function: private::build_request
    - function: private::handle_response
    - function: private::get_error_response
    - impl: impl api::PreVerify for Stripe
    - impl: impl services::ConnectorIntegration<
        api::Verify,
        types::VerifyRequestData,
        types::PaymentsResponseData,
    > for Stripe

**crates/router/src/connector/stripe/transformers.rs**
  Add:
    - function: private::try_from
    - function: private::try_from
    - function: private::from
    - struct: pub::SetupIntentRequest
    - struct: pub::SetupIntentResponse
    - impl: impl TryFrom<&types::VerifyRouterData> for SetupIntentRequest
    - impl: impl TryFrom<types::ResponseRouterData<F, SetupIntentResponse, T, types::PaymentsResponseData>> for types::RouterData<F, T, types::PaymentsResponseData>
    - impl: impl From<(api::PaymentMethod, enums::AuthenticationType)> for StripePaymentMethodData

**crates/router/src/core/errors/api_error_response.rs**
  Modify existing code

**crates/router/src/core/errors/utils.rs**
  Modify existing code

**crates/router/src/core/payments/flows.rs**
  Add:
    - mod: private::verfiy_flow

**crates/router/src/core/payments/flows/verfiy_flow.rs**
  Add:
    - function: private::construct_r_d
    - function: private::decide_flows
    - function: pub::decide_flow
    - function: private::generate_mandate
    - impl: impl ConstructFlowSpecificData<api::Verify, types::VerifyRequestData, types::PaymentsResponseData> for PaymentData<api::Verify>
    - impl: impl Feature<api::Verify, types::VerifyRequestData> for types::VerifyRouterData
    - impl: impl types::VerifyRouterData

**crates/router/src/core/payments/transformers.rs**
  Add:
    - function: private::try_from
    - impl: impl TryFrom<PaymentData<F>> for types::VerifyRequestData

**crates/router/src/types.rs**
  Modify existing code

**crates/router/src/types/api/payments.rs**
  Add:
    - struct: pub::Verify
    - trait: pub::PreVerify