Port the `LocalHTTPProxy` from `yapapi`

[johny-b]

This is a useful feature that would simplify building things with golem-core.

I'm not sure where such thing should be placed. We need some place for "general utilities", like yapapi.contrib. Currently we have default_payment_manager and default_logger - I think they should be together with the proxy.

UPDATE:

1. There is a working prototype: https://github.com/golemfactory/golem-core-python/blob/jb/socket_proxy_prototype/proxy_connect.py
2. There should be an option to use the proxy in a non-golem context (as in the linked example), as this might be convenient in certain cases
3. --> SocketProxy should have a public interface layer not directly connected to anything golem-related

IMPORTANT: we should start with designing the interface

[johny-b]

UPDATE:

Maybe we don't need any specific socket proxy, just let's make this:
https://github.com/golemfactory/zmqpoc/blob/main/socket_forwarder.py
easily available?