feat: rate limiting in irpc and irpc-iroh

[rklaehn]

This implements hooks to implement rate limiting for irpc and iroh. You can rate limit / filter based on SocketAddr (for irpc) and SocketAddr and EndpointId (for irpc-iroh).

You can filter by SocketAddr even before the SocketAddr is validated, but you should usually wait until it is validated, otherwise somebody could send you spoofed packets and rate limit valid clients.

There is also a system in place to allow for per-request rate limiting and filtering. This is the same for irpc and irpc-iroh.

[Frando]

Is the irpc-iroh rate limiter compatible with using a Router? I pretty much always use irpc with a router (and n0des, where this feature request comes from, does too).