feat(router): add list payment link support

[sahkal]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

Add List payment link support based on merchant_id

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

Test case

curl --location 'http://localhost:8080/payment_link/list?limit=2' \
--header 'api-key: dev_xVgcVhcjChHQjUNu0dV9FEzVd7nkOn0YbBfyGW202qlAoYY8vplqBlsA3ivZbYay' 

response

[
    {
        "payment_link_id": "plink_genDC3Pj15o4AUbjBRtD",
        "merchant_id": "merchant_1700034333",
        "link_to_pay": "http://localhost:8080/payment_link/merchant_1700034333/pay_nVYe8IrGcCouQx9o8mRY",
        "amount": 3423,
        "created_at": "2023-11-17T12:05:22.937Z",
        "link_expiry": "2025-10-09T16:23:10.000Z",
        "description": "For selling Tea",
        "status": "active",
        "currency": "USD"
    },
    {
        "payment_link_id": "plink_7B1oGz1MSCBvJathfNDI",
        "merchant_id": "merchant_1700034333",
        "link_to_pay": "http://localhost:8080/payment_link/merchant_1700034333/pay_36QjBcER7pzkUkSNcMLK",
        "amount": 3423,
        "created_at": "2023-11-16T09:30:50.387Z",
        "link_expiry": "2025-10-09T16:23:10.000Z",
        "description": null,
        "status": "active",
        "currency": "USD"
    }
]

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable

[Narayanbhat166]

All the checks are failing, seems like there are some commits in this PR which are unrelated