Refactor component registry

[telsethag]

Review and refactor registry to support messaging changes.

• [X] Define MemberLocation (ML) class, MemberExchange (ME) class, and support for EC selection metrics (e.g., latency and throughput)
• [X] Define MemberExchange Reports DO and add to declarative configuration
• [x] Add local ME and ML to CR
• [x] Correct CR "lead module" to be "lead cluster module" to account for 1 member module per HZ Member rule
• [x] Modify CR status observer for ECs to maintain ML, local ME, and DO ME