dclipp

feat(auth): mock idp initial commit

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## Changes proposed in this pull request - create a mock IDP for testing purposes - sub-tasks: - [X] basic UI - [x] dynamic configuration - [x] scaffold API calls...

feat(backend): validate httpsig on rs requests using auth implementation

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- Export `verifySig` from `auth` package - use `auth`'s `verifySig` implementation to validate the signature received after and introspection request ## Changes proposed in this pull request - fixes #585...