Implement WebSocket Streaming Methods

[jribbink]

Issue To Be Solved

Currently, the websocket streaming methods that exist on mainnet access nodes & are in use by all recent SDK releases do not exist on the emulator. Calling them will cause the emulator to crash.

This was a decision made during the release due to time constraints, however, it required SDKs to maintain legacy code to run against the emulator network.

(Optional): Suggest A Solution

Implement streaming methods

(Optional): Context

FCL still includes legacy support for polling data when an emulator chain ID is detected. Implementing the streaming methods allows us to remove this

[bluesign]

this should be pretty easy to implement, as everything should be in flow-go. I can take it if you are not already working on it.