Add method to get YANG module sources for CM handle

- part of this commit includes renaming the enum SyncState to
  DataStoreSyncState

Issue-ID: CPS-1064
Signed-off-by: emaclee <lee.anjella.macabuhay@est.tech>
Change-Id: I6bf419141a1b33f09871946445cdfff422c8c354
33 files changed