[Relation] Scoping for single models

[dhmlau]

Description / Steps to reproduce / Feature proposal

Scoping for single models: https://loopback.io/doc/en/lb3/Model-definition-JSON-file.html#scopes

@b-admike , pls add more details!

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[dhmlau]

@b-admike , is it still needed? If yes, could you please provide more information and acceptance criteria? thanks.

[stale]

This issue has been marked stale because it has not seen activity within six months. If you believe this to be in error, please contact one of the code owners, listed in the CODEOWNERS file at the top-level of this repository. This issue will be closed within 30 days of being stale.

[stale]

This issue has been closed due to continued inactivity. Thank you for your understanding. If you believe this to be in error, please contact one of the code owners, listed in the CODEOWNERS file at the top-level of this repository.