Add Event Bus (#184)

Major internal refactor to use an event bus to pass event/messages along. These changes are largely invisible user facing but sets up internal design for real time stats and information.

- `--watch-config` logic refactored for events
- remove multiple SSE api endpoints, replaced with /api/events
- keep all functionality essentially the same
- UI/backend sync is in near real time now

ui/src/pages/LogViewer.tsx

@@ -3,14 +3,12 @@ import { useAPI } from "../contexts/APIProvider";
 import { usePersistentState } from "../hooks/usePersistentState";
 
 const LogViewer = () => {
-  const { proxyLogs, upstreamLogs, enableProxyLogs, enableUpstreamLogs } = useAPI();
+  const { proxyLogs, upstreamLogs, enableAPIEvents } = useAPI();
 
   useEffect(() => {
-    enableProxyLogs(true);
-    enableUpstreamLogs(true);
+    enableAPIEvents(true);
     return () => {
-      enableProxyLogs(false);
-      enableUpstreamLogs(false);
+      enableAPIEvents(false);
     };
   }, []);