Feature | Extend Swagger Coverage for controller OAuth2MembersApiController (#435)

* feat: Extend Swagger Coverage for controller `OAuth2MembersApiController`

* feat: Add public endpoint

* feat: Enhance OpenAPI documentation for Members API with OAuth2 security and request schemas

* chore: revert app/ModelSerializers/OwnMemberSerializer.php

* feat: Move Member schema to its own file. Add required changes

* chore: fix doc generation

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Co-authored-by: Matias Perrone <github@matiasperrone.com>

Author: matiasperrone-exo