[lib] Rename MinimallyEncodedMemberInfo to MemberInfo

Summary:
Part of https://linear.app/comm/issue/ENG-6366/rename-minimallyencodedinfo-to-rawinfo

Depends on D10790

Test Plan: flow, used IDE rename refactor

Reviewers: ashoat, ginsu, tomek

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D10791