fix(components): update index file to export all components

Author: akoushke

src/components/index.js

@@ -1,2 +1,4 @@
 export {default as WebexAvatar} from './WebexAvatar/WebexAvatar';
 export {default as WebexActivity} from './WebexActivity/WebexActivity';
+export {default as WebexActivityStream} from './WebexActivityStream/WebexActivityStream';
+export {default as WebexDataProvider, AdapterContext} from './WebexDataProvider/WebexDataProvider';