Metadata management flow

[nitisht]

Current STREAM_INFO map may have an issue with parallel writes to the map for the same stream.

1. We need to implement a locking mechanism that allows exclusive writes to the map.
2. Additionally Metadata map get and get methods should handle both local and S3. This way we don’t duplicate all the code to fallback on object store everywhere. a. Get Flow: Fetch metadata from local and fallback to object store if not found. b. Set Flow: Set to object store and then try setting it locally.

[nitisht]

List streams should fetch data from metadata first, instead of hitting S3 for each call. See #69 for context

[nitisht]

@trueleo is this still relevant?

[trueleo]

@nitisht No