Add notification checkboxes in Stream Info view.

[zee-bit]

This issue extends PR #880 and should work towards improving the Stream Info view in ZT. Currently, there are just two checkboxes in StreamInfoView(mute_stream & pin_to_top). These are fine but we want to add more checkboxes related to Stream notifications. We could potentially add:

• Audible desktop notification
• Email notification
• Visual desktop notification, and
• Mobile notification

The logic could be borrowed from zulip/zulip or those other checkboxes already present in ZT. Zulip's API documentation should prove helpful in tackling this issue.

@neiljp I have opened this issue(to keep track of the tasks that needs to be done, and) as a continuation of the work I already did in #880

NOTE These require underlying fetching handling updates of the settings, in addition to the UI, ie. we expect to synchronize these with the server (though we might have our settings in future) -- neiljp

[zee-bit]

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