[lib] Update rawMessageInfoFromClientDB to support RawUpdateRelationshipMessageInfo

Summary:
Basically branch on clientDBMessageInfo.type to determine whether we should return a RawUpdateRelationshipMessageInfo or RawLegacyUpdateRelationshipMessageInfo.

Depends on D11452

Test Plan: Added log statements to ensure that both RawUpdateRelationshipMessageInfo and RawLegacyUpdateRelationshipMessageInfo were properly constructed from CLientDBMessageInfo.

Reviewers: ginsu, tomek, varun, will

Reviewed By: ginsu

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D11455