Issue:
feat(pm_list): add support for bank debits

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] New feature

## Description
<!-- Describe your changes in detail -->
This PR adds support for `bank_redirects` in payment methods list. The response will be of the form 
```json
{
  "payment_method": "bank_debit",
  "payment_method_types": [
    {
      "payment_method_type": "sepa",
      "payment_experience": null,
      "card_networks": null,
      "bank_names": null,
      "bank_debits": {
        "eligible_connectors": [
          "stripe",
          "adyen"
        ]
      }
    },
    {
      "payment_method_type": "ach",
      "payment_experience": null,
      "card_networks": null,
      "bank_names": null,
      "bank_debits": {
        "eligible_connectors": [
          "adyen"
        ]
      }
    }
  ]
}
```


## Motivation and Context
<!--
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)?
-->
- Create a payment connector with `sepa` and `ach` enabled.
- Create a payment with confirm set to false
- Call the pm list.

## 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


Resolution:
<think>
PR Context:
- Title: feat(pm_list): add pm list support for bank_debits 
- Merged: 2023-05-11T10:54:01Z
- Files changed: 2 files
- Commits: 3 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] New feature

## Description
<!-- Describe your changes in detail -->
This PR was not merged to main in #927 because of github not automatically changing the base branch when parent branch is merged to main.

### Additional Changes

- [x] This PR modifies the API contract
Adds support for bank debits in the payment list, can be checked in #927 

<!-- 
Provide links to the files with corresponding changes.

Follo
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** feat(pm_list): add pm list support for bank_debits  (#1120)
Files to modify:


**crates/api_models/src/payment_methods.rs**
  Add:
    - struct: pub::BankDebitTypes

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