[EPIC] WebSockets

[tzdybal]

Experiments with Ignite CLI shows multiple issues with Optimint-Tendermint compatibility. This is a tracks progress of discovering and fixing issues.

• WebSockets: add CORS support ev-node#436
• Finish Status method implementation ev-node#241 - especially NodeInfo needs to be set
• WebSockets: string should be used instead of SubscribeArgs #17
• WebSockets: invalid response type #19
• WebSockets: improve handling of different message types #20

[Manav-Aggarwal]

Needs investigation