Include extra into user claims

Igor Drozdovrequested to merge
id-include-extra-into-user-claims into main

What does this MR do and why?

A follow-up to feat: add extra_claims support to TokenAuthority (!225 - merged). Even though the extra claims are added to the token, it's not possible to access them without decoding the token. Since decoding the token is performed in cloud-connector library, we need to add a new field to UserClaims to contain the extra claims.

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