LcmEvent state handler refactoring

- State handler will now handle new structure of LcmEvent.
- We have 3 types of events i.e create, update and delete.
- Introduced the LcmEventCreatorHelper to delegate some of the
  responsibility of event creation based on event type and the state.
- New tests and existing refactoring
- Code rebased
- Refactored name as per group code review
- Code rebase with other commits
- Used copy constructor for deep copy operation of NcmpServiceCmhandle
  and CompositeState
- UPCOMING : Related user stories to trigger the event publishing using
  state handler.

Issue-ID: CPS-1128
Change-Id: I94b5a87d37d6a174c017ee0aa37cd0f0f74ba084
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>