HTTP Service support for each node to talk to each other

[brewkode]

• [x] gRPC <-> HTTP
• [x] GET - input key, return back the data as "bytes"
• [x] PUT - input key, data bytes
• [x] HEALTH - Report health of the node
• [x] SHARD_INFO - Should report current shards that this node manages

[ashwanthkumar]

Picking this up!

[ashwanthkumar]

Tracking the SHARD_INFO as part of #20 - since we might need that info only as part of rebalancing. Closing this task.