This change adds the following new resource implementations:

- ArchivedReviewRequestItemResource

- ArchivedReviewRequestListResource

- MutedReviewRequestItemResource

- MutedReviewRequestListResource
These resources are special because they do not support GET operations,

and the regular links introspection therefore doesn't work. The

implementation of these is therefore done as a custom layer that allows

us to get a "bare" instance of the resource, which can then be used for

create or delete as appropriate.

Ran unit tests.
Used the new resources from a test script and saw that everything

  worked as expected.