fix(required_fields_v2): add `payment_required_fields` file in docker

[Narayanbhat166]

Type of Change

• [x] Bugfix

Description

This PR allows the required fields configuration to be provided by the configuration file in docker.

Motivation and Context

This is necessary since there is no other way to provide the configuration in environment variables.

How did you test it?

This has been tested on the integ environment

• Create a payment method session

curl --location 'https://integ-api.hyperswitch.io/v2/payment-methods-session' \
--header 'x-profile-id: pro_KZvF738f3wnMWSIcLGSN' \
--header 'Authorization: api-key=<>' \
--header 'Content-Type: application/json' \
--data-raw '{
    "customer_id": "12345_cus_01966c6b108072a1b9aac1e76f7d79f5",
     "billing": {
        "address": {
            "first_name": "John",
            "last_name": "Dough"
        },
        "email": "[email protected]"
    }
}'

• Call payment method list, check for the required fields

{
    "payment_methods_enabled": [
        {
            "payment_method_type": "card",
            "payment_method_subtype": "credit",
            "required_fields": [
                {
                    "required_field": "payment_method_data.card.card_number",
                    "display_name": "card_number",
                    "field_type": "user_card_number",
                    "value": null
                },
                {
                    "required_field": "payment_method_data.card.card_exp_year",
                    "display_name": "card_exp_year",
                    "field_type": "user_card_expiry_year",
                    "value": null
                },
                {
                    "required_field": "payment_method_data.card.card_cvc",
                    "display_name": "card_cvc",
                    "field_type": "user_card_cvc",
                    "value": null
                },
                {
                    "required_field": "payment_method_data.card.card_exp_month",
                    "display_name": "card_exp_month",
                    "field_type": "user_card_expiry_month",
                    "value": null
                }
            ]
        },
        {
            "payment_method_type": "card",
            "payment_method_subtype": "debit",
            "required_fields": []
        }
    ],
    "customer_payment_methods": []
}

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