feat(lib-jitsi-meet) log UA string too

This way we can know from the logs what we are working with.

globals.native.d.ts

@@ -40,6 +40,7 @@ interface IWindow {
 
 interface INavigator {
     product: string;
+    userAgent: string;
 }
 
 declare global {

react/features/base/lib-jitsi-meet/actions.ts

@@ -57,7 +57,8 @@ export function initLib() {
                 isOnline: isOnline(state)
             });
 
-            logger.info(`lib-jitsi-meet version:${JitsiMeetJS.version}`);
+            logger.info(`lib-jitsi-meet version: ${JitsiMeetJS.version}`);
+            logger.info(`User Agent: ${navigator.userAgent}`);
 
             dispatch({ type: LIB_DID_INIT });
         } catch (error: any) {