Reduce console log spam (#3896)

* Reduce console log spam

A couple of different things:

 * Increase the `MaxListeners` setting on `MatrixClient` and `Thread`, so that
   we don't get "possible EventEmitter leak" warnings

 * Disable a couple of warnings/info lines that are just part of regular
   operation and are logged in large volumes.

* another noisy log line

* Reinstate warning about receipts for missing events

Apparently this is being worked on

src/client.ts

@@ -1494,6 +1494,9 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
 
         this.ignoredInvites = new IgnoredInvites(this);
         this._secretStorage = new ServerSideSecretStorageImpl(this, opts.cryptoCallbacks ?? {});
+
+        // having lots of event listeners is not unusual. 0 means "unlimited".
+        this.setMaxListeners(0);
     }
 
     public set store(newStore: Store) {