multi: add channel open parameters to channel acceptor

Add more fields to channel acceptor response so that users can have more
fine grained control over their incoming channels. With our chained
acceptor, it is possible that we get inconsistent responses from
multiple chained acceptors. We create a conjugate repsponse from all the
set fields in our various responses, but fail if we get different, non-
zero responses from our various acceptors. Separate merge functions are
used per type so that we avoid unexpected outcomes comparing interfaces
(panic on comparing types that aren't comparable), with casting used
where applicable to avoid code duplication.

rpcserver.go

@@ -6391,7 +6391,8 @@ func (r *rpcServer) ChannelAcceptor(stream lnrpc.Lightning_ChannelAcceptorServer
 	// Create a new RPCAcceptor which will send requests into the
 	// newRequests channel when it receives them.
 	rpcAcceptor := chanacceptor.NewRPCAcceptor(
-		stream.Recv, stream.Send, r.cfg.AcceptorTimeout, r.quit,
+		stream.Recv, stream.Send, r.cfg.AcceptorTimeout,
+		r.cfg.ActiveNetParams.Params, r.quit,
 	)
 
 	// Add the RPCAcceptor to the ChainedAcceptor and defer its removal.