Composite State to handle dmi-reg YANG updates

- Introduce CompositeState object which handles change in updated YANG for dmi-registry
- Used Builder pattern as some of the fields are optional
- Removed the abstract ready method from CmHandleState which was used as
  state machine
- Fixed few test cases

Issue-ID: CPS-1042
Change-Id: I8aaf6f819c66b3a9d30c5e8f0a0007f9528b247f
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
10 files changed