http2: do not allow socket operations on session.socket

[mcollina]

In http2, the session exposes a socket property. However this socket is completely managed by HTTP2 and it is exposed only for information retrieval purposes. The socket itself should not be tampered with, as it can result in unpredictable state.

In the compatibility layer, we are wrapping it in a Proxy, and we are disabling some of the problematic methods (pause(), resume(), etc). I think we should do it in the core API as well.

• Version: master
• Platform: all
• Subsystem: http2

Ref: #16211

[mcollina]

cc @jasnell @apapirovski @trivikr

[apapirovski]

I'm planning to work on this later in the week but if someone wants to take it on before I get there, feel free to do so. Just please post a comment to claim it so we don't overlap.