Tracking etcd API status

[jeffa5]

This issue is a high-level tracking issue for the endpoint implementations (gRPC and JSON):

KV

• Range
  • Missing historical querying Implement historical querying #42
• Put
• DeleteRange
• Txn Implement txn endpoint #31
• Compact Implement compaction of the kvindex #63

Watch

• Watch
  • Create watch
  • Get watch progress
  • Cancel watch

Leases

• Create lease Leases #55
• Keep lease alive Implement Lease KeepAlive #68
• Revoke lease Leases #55
• List leases Leases #55
• Lease time to live Leases #55

Maintenance

• Status Status endpoint #93

Cluster

• Member add
• Member remove
• Member update
• Member list #91
• Member promote

[jeffa5]

Lots more we could add: https://etcd.io/docs/v3.5/dev-guide/api_reference_v3/