Issue: feat(router): Add `psp_tokenization_enabled` field in Customer Saved Payment Methods List

Required to show whether `psp_tokenization` is enabled for a saved payment method

Resolution: <think>
PR Context:
- Title: feat(router): Return psp_tokenization_enabled in Customer PML
- Merged: 2025-03-20T10:04:56Z
- Files changed: 8 files
- Commits: 7 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [x] New feature
- [x] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Added `psp_tokenization_enabled` field to `CustomerPaymentMethod` that denotes whether `psp_tokenization` is enabled for a saved payment method

### Additional Changes

- [x] This PR modifies the API contract
- [ ] This PR modifies the da
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** feat(router): Return psp_tokenization_enabled in Customer PML (#7519)
Files to modify:


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

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

**crates/openapi/src/openapi.rs**
  Modify existing code

**crates/openapi/src/openapi_v2.rs**
  Modify existing code

**crates/openapi/src/routes/payment_method.rs**
  Modify existing code

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