🎙️ a11y: Screen Reader Support for Dynamic Content Updates (#3625)

* WIP: first pass, hooks

* wip: isStream arg

* feat: first pass, dynamic content updates, screen reader announcements

* chore: unrelated, styling redundancy

client/src/a11y/LiveMessenger.tsx

@@ -0,0 +1,12 @@
+import React from 'react';
+import AnnouncerContext from '~/Providers/AnnouncerContext';
+
+interface LiveMessengerProps {
+  children: (context: React.ContextType<typeof AnnouncerContext>) => React.ReactNode;
+}
+
+const LiveMessenger: React.FC<LiveMessengerProps> = ({ children }) => (
+  <AnnouncerContext.Consumer>{(contextProps) => children(contextProps)}</AnnouncerContext.Consumer>
+);
+
+export default LiveMessenger;