Onboard app level pvtkeyjwt reuse config

[mpmadhavig]

Purpose

This PR contains changes relevant to onboarding of App level config to Allow Reuse of Private Key JWT. The changes will be reflected at the below endpoints:

1. /{applicationId}/inbound-protocols/oidc - GET, PUT, DELETE
2. /meta/inbound-protocols/oidc

• The config will be saved as a SP OIDC property.
• For the already created applications, as the config is not added, the old org level config will be taken.
  • When retrieving the application via a GET request, if the config is unavailable, org level config will be set.
• For the newly created applications, the user configured value will be saved.
  • The org level config will be totally irrelevant for the new application.

Related PRs:

wso2/product-is#20546

[Thumimku]

LGTM