Add support to get local claims with associated external claims

[VivekVinushanth]

Is your suggestion related to an experience ? Please describe. Currently to confirm that whether a local claim is being associated with any external claims, there is no straight forward way. We have to fetch the claims from all external claim dialects and then do a search in all to see if there are any associated external claims for a local claim. The client or user has to write this logic.

Describe the improvement Provide BE support for this case where getLocalClaims will also fetch the associated external claims.

[VivekVinushanth]

Being fixed with

• https://github.com/wso2/carbon-identity-framework/pull/4442
• https://github.com/wso2/identity-api-server/pull/423

[VivekVinushanth]

Revert PRs

• https://github.com/wso2/carbon-identity-framework/pull/4453
• https://github.com/wso2/identity-api-server/pull/427