Smriti/370090 create api manage customizable roles

What does this MR do and why?

#370090 (closed)

Created GET POST and DELETE endpoints for member_roles

Screenshots or screen recordings

GET Request

POST Request

DELETE Request

How to set up and validate locally

1. Enable the feature flag

   gdk rails console
   
   Feature.enable('api_customizable_roles')

2. Use curl requests to verify the APIs

   curl --location --request GET 'https://gdk.test:3443/api/v4/groups/22/member_roles/' \
   --header 'PRIVATE-TOKEN:< Valid Private Token for Admin role>' \
   --form 'base_access_level="20"' \
   --form 'download_code="0"'
   
   
   curl --location --request POST 'https://gdk.test:3443/api/v4/groups/22/member_roles/' \
   --header 'PRIVATE-TOKEN:< Valid Private Token for Admin role>' \
   --form 'base_access_level="30"' \
   --form 'download_code="1"'
   
   
   curl --location --request DELETE 'https://gdk.test:3443/api/v4/groups/22/member_roles/1' \
   --header 'PRIVATE-TOKEN:< Valid Private Token for Admin role>'

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