CM Handle State: define and agree new dmi-registry yang model supporting States

NCMP should be able to handle a large (10,000s!) batch of registrations at once. To make this possible we need to 

1. Create updated DMI Registry Yang Schema (using @yyyy-mm-dd) in changelog/db/changes/data/yang-models/dmi-registry @ 2021-12-13.yang to store Handle State
   see also [https://wiki.onap.org/display/DW/CPS-677+Support+%27public%27+Cm+Handle+Properties#CPS677Support'public'CmHandleProperties-December2021YangModelforPublicPropertiesSupport
2. Add State, LockReason and LockReasonDetails as (Yang)Strings to the schema. Any validation or enum-limitations can be handled in the Java code.
3. consider timestamp for retry and timeout related scenarios as part of same schema update to reduce overhead of Liquibase changesets
4. Test/demo using CPS-Core 
   1. Can create anchor with new schema
   2. Can add and create data 

A/C

1. Propose and agree new model (as draft commit) with team and stakeholders
2. Demo 
   1. Can create anchor using new model
   2. Can add data for new model
   3. Can query data using file based on state
3. Agree new name for dataspace. Replace Admin dataspace?
4. Describe impacts to codebase

Out of Scope:

1. No Code changes!
2. No CSIT Test