feat: layer2 websocket

[nugaon]

Introducing on-demand stream messaging channels between Bee nodes so that other P2P applications can communicate between each other directly to support live services.

On GET /layer2/subscribe/{streamName} endpoint the client opens a websocket connection through which messages can pass between connected nodes (which can be managed by calling POST /connect/{multiAddress} or DELETE /peer/{address}

The PR is experimental in design and discussions are open for the feature.

send message format:
[actionType] [actionParams]
available actionTypes:

• 0: unicast - send message to a node
  • actionParams:
    • overlay address of the target node
    • message
• 1: broadcast - send message to all connected node
  • actionParams:
    • message

received message format
[responseType] [responseParams]

available responseType

• 0: message
  • responseParams
    • overlay address of the sender node
    • message

Checklist

• I have read the coding guide.
• My change requires a documentation update, and I have done it.
• I have added tests to cover my changes.
• I have filled out the description and linked the related issues.

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Open API Spec Version Changes (if applicable)

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