Share chat url

Modal for video owner (and instance's moderators) that allows to generate a link to the chat. So you can - for example - obtain the url to use for OBS integration.
WIP

client/videowatch/logger.ts

@@ -0,0 +1,10 @@
+const logger = {
+  log: (s: string) => console.log('[peertube-plugin-livechat] ' + s),
+  info: (s: string) => console.info('[peertube-plugin-livechat] ' + s),
+  error: (s: string) => console.error('[peertube-plugin-livechat] ' + s),
+  warn: (s: string) => console.warn('[peertube-plugin-livechat] ' + s)
+}
+
+export {
+  logger
+}