Enable stream settings view to toggle common stream settings

[sumanthvrao]

Currently, the web-app has the following stream settings commonly accessible:

Such a view is much needed in ZT and will help toggle simple stream settings with ease. Currently out of all the stream settings, we only support mute stream with the hotkey (m/M).

The tasks here can be broken down into :

• [x] Add pin/unpin feature. (#695)
• [ ] Add read all message in stream feature. (#646)
• [ ] Add unsubscribe from stream feature.
• [x] Create a stream settings view which can toggle all the stream settings (including muting stream) (#695)

For other thoughts on this, please discuss on #zulip-terminal at chat.zulip.org

[neiljp]

It's worth noting that an 'unsubscribe' feature is useful, but perhaps should be accompanied by other work to allow subscribing too, to avoid accidentally doing something in ZT which cannot be recovered in ZT.

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[kaustubh-nair]

Added new view, pin and muting features in #695