Yield support for web sockets and requests

[sansyrox]

This release of web sockets will not have support for async functions.

Reason:

I was trying to implement async support in the traditional way. i.e. execute the entire async function in the process pool.

However, we must realise that WebSockets are different from HTTP requests in the way that sending the response to every await to the websocket clients will make sense. If the await returns None, the clients can choose to not do anything.

e.g.

def hello_world():
     return "Hello, world!" # this should execute every time

async def hello_world():
        await xyz() # called once
        await zya() # called once

This can be give a more considerate thought in the future.

Moreover, we can also check continuous responses using yield.