subscribe to new blocks through a REST endpoint

[jbibla]

Summary

right now, client developers need to connect to both Tendermint RPC and the SDK REST API to access the data we need. it would be great if we could use the REST API to subscribe to a websocket for new blocks as they come in (as Tendermint RPC provides).

if this is implemented, please make sure proposer_address is bech32 not a hash.

thank you kindly.

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[fedekunze]

closed via #4387 (applies for all events)

[alexanderbez]

Are we sure this is closed @fedekunze? Events doesn't apply to this directly.