feat: <breaking_change> persistence spec refactoring to replace metadata params with metadata object from at_commons

[murali-shris]

- What I did

• refactored persistence spec to replace optional metadata params with metadata from at_commons
• any future addition of metadata will not affect the method signature in the spec - How I did it
• added dependency to at_commons
• changed method signature of put/create methods in Keystore to replace optional metadata params with metadata object from at_commons
• removed putAll method since put method should suffice for updating either value or metadata or both - How to verify it
• verify the tests in persistence secondary and server after uptaking the spec changes
• tests in this PR https://github.com/atsign-foundation/at_server/pull/1822

[gkc]

@murali-shris What's the status of this PR? Should it be merged, or closed?