Deprecation/Removal: edx-user-state-client [DEPR#167]

Hi,

We plan to deprecate the edx-user-state-client repo.
Please read [DEPR]: [DEPR] edx-user-state-client, Issue: deprecate edx-user-state-lcient for more information and to post any questions/comments. The proposed deadline for comments before acceptance is September 21, 2023.