feat(payment-methods): Add volatile payment method id support in proxy v2

[prasunna09]

Type of Change

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

Description

Add volatile payment method id support in proxy to fetch payment method object from Redis(volatile storage) and process the request.

this volatile payment method id is generate during guest checkout tokenization in payment method service.

changes made-

• converted domain model to diesel model of payment method when storing in redis.
• used, encrypt service to encrypt and decrypt the data stored
• while converting to storage model, the temp customer id is generated since customer id is mandatory in diesel model

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?

payment method create - ``` curl --location 'http://localhost:8080/v2/payment-methods' \ --header 'Content-Type: application/json' \ --header 'Accept: application/json' \ --header 'X-Profile-Id: pro_pKQdFzRh288nIJx2Wlsr' \ --header 'Authorization: api-key=dev_1SRojWWY0S26DlYl0ddumReGAqRKPS6GOFM6HGdyYed2kwomdm0K4FkqwgGgWer1' \ --header 'api-key: dev_1SRojWWY0S26DlYl0ddumReGAqRKPS6GOFM6HGdyYed2kwomdm0K4FkqwgGgWer1' \ --data '{

"payment_method_type": "card",
"payment_method_subtype": "credit",
"payment_method_data": {
    "card": {
        "card_number": "5555 3412 4444 1115",
        "card_exp_month": "07",
        "card_exp_year": "2030",
        "card_holder_name": "joseph Doe"
    }
},
"storage_type": "volatile"

}'

proxy api - 

curl --location 'http://localhost:8080/v2/proxy'
--header 'Content-Type: application/json'
--header 'Accept: application/json'
--header 'X-Profile-Id: pro_pKQdFzRh288nIJx2Wlsr'
--header 'Authorization: api-key=api key'
--data '{
"request_body": {
"source": {
"type": "card",
"number": "{{$card_number}}",
"expiry_month": "{{$card_exp_month}}",
"expiry_year": "{{$card_exp_year}}",
"billing_address": {
"address_line1": "123 High St.",
"address_line2": "Flat 456",
"city": "London",
"state": "GB",
"zip": "SW1A 1AA",
"country": "GB"
}
},
"processing_channel_id": "processing_channel_id",
"amount": 6540,
"currency": "USD",
"payment_type": "Regular",
"reference": "ORD-5023-4E89",
"description": "Set of 3 masks",
"capture": true,
"capture_on": "2019-09-10T10:11:12Z",
"billing_descriptor": {
"name": "Withdrawal",
"city": "London"
},
"shipping": {
"address": {
"address_line1": "Checkout.com",
"address_line2": "Flat 456",
"city": "London",
"state": "GB",
"zip": "SW1A 1AA",
"country": "GB"
},
"phone": {
"country_code": "+1",
"number": "415 555 2671"
}
}
},
"destination_url": "https://api.sandbox.checkout.com/payments",
"headers": {
"Content-Type": "application/json",
"Authorization": "api key"
},
"token": "12345_pm_019b659a23f77531af02232f9c4098b9",
"token_type": "volatile_payment_method_id",
"method": "POST"

}'

data stored in redis has been fetched and decrypted in proxy flow
<img width="1728" height="100" alt="image" src="https://github.com/user-attachments/assets/c12ae8a3-3a90-4f8a-ac3b-27299ae67418" />

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] 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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 97 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@d9226b2). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
crates/router/src/core/proxy/utils.rs	0.00%	93 Missing ⚠️
...es/router/src/core/payment_methods/transformers.rs	0.00%	2 Missing ⚠️
crates/router/src/core/proxy.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10597   +/-   ##
=======================================
  Coverage        ?    6.38%           
=======================================
  Files           ?     1268           
  Lines           ?   318754           
  Branches        ?        0           
=======================================
  Hits            ?    20358           
  Misses          ?   298396           
  Partials        ?        0           

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The base branch was changed.