feat(payment_link): added display_sdk_only option for displaying only sdk without payment details

[sahkal]

Type of Change

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

Description

Currently we show payment link with payment details, where
left side of the payment link contains payment details and the right side contains the sdk.

This is a merchant requirement where they want only the sdk to be displayed in payment link and it should be centered with custom color background.

Additional Changes

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

Added "display_sdk_only" to payment_link_config

Motivation and Context

How did you test it?

TestCase :

Do payment Create with the following curl and test all transaction mobile view etc for payment link.

curl --location 'https://sandbox.hyperswitch.io/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: snd_oaidL49hiU3HmQRKSBsASyb1yANBmLJQJoDsulQbkSuZQiO7xQTj6ks0Alhtr3fD' \
--data '{
    "amount": 1130,
    "currency": "USD",
    "return_url": "https://hyperswitch.io",
    "payment_link": true,
    "payment_link_config": {
        "theme": "#003E78",
        "sdk_layout": "spaced_accordion",
        "display_sdk_only":true
    }
}'

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

[kashif-m]

Looks good, added two minor suggestions.

[kashif-m]

We can use paymentDetails here

[kashif-m]

Possible to format this file?