Issue:
refactor(payment_methods): add `requires_cvv` field to customer payment method list api object

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Added new field in the customer list payment method object to include `requires_cvv` field which specifies whether for a given merchant, cvv is a required_field to be collected. If an entry is found in config table, then requires_cvv is set to `false` i.e., by default cvv is made a required_field for all merchants 

Requires db insertion into configs table with key as `<merchant_id>_requires_cvv` and config as `false`
DB query - `insert into configs(key,config) values('<merchant_id>_requires_cvv',false);`

### Additional Changes

- [x] This PR modifies the API contract
- [ ] 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
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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).
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## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
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ListPaymentMethodForCustomer object
![image](https://github.com/juspay/hyperswitch/assets/70657455/bc5e3766-ecaf-4a21-bed2-ef52f0c5f9bd)


## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [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: fix(payment_methods): add `requires_cvv` field to customer payment method list api object
- Merged: 2023-08-03T12:01:23Z
- Files changed: 3 files
- Commits: 1 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Hotfix [#1852](https://github.com/juspay/hyperswitch/pull/1852)

### Additional Changes

- [x] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment vari
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix(payment_methods): add `requires_cvv` field to customer payment method list api object (#1858)
Files to modify:


**crates/api_models/src/payment_methods.rs**
  Modify existing code

**crates/router/src/core/payment_methods/cards.rs**
  Modify existing code