* [Server] Serve an extension's methods under the modern lifecycle
The modern dispatcher takes the method-to-extension map the builder collects,
so a method belonging to an extension this server does not serve is answered
-32601 naming the extension instead of a bare "no handler found". It is still
an unknown method - the server genuinely does not implement it - but the
caller can now act on the answer.
* [Server] Reject two extensions claiming the same RPC method
The message factory resolves a contested method to whichever class
registered first, while extensionMethods kept the last one — so error
messages could name the wrong extension. Also fixes a test that
claimed to prove a method gets named by its extension while asserting
the opposite; the case it meant to cover (an enabled extension with no
handler for one of its methods) had no coverage at all.
