[ECO-4115] Split usePresence hook into different hooks for entering presence and subscribing to presence events

[VeskeR]

Resolves #1621

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[ttypic]

Looks good to me, I think this will be more clear for users than subscribeOnly option in usePresence. Added some comments and we need to merge #1676 first

[VeskeR]

@ttypic when removing eslint-disable-next-line react-hooks/exhaustive-deps from hooks, I noticed that usePresence hook also doesn't declare 'messageOrPresenceObject' parameter (initial state when entering presence) as dependency in its useEffect/useCallback, meaning it won't re-enter when this parameter changes. It gets complicated by the fact that this parameter can be an object (passed by a ref) and users can call usePresence with an object literal usePresence('channel', {foo:'bar'}) in their components, which would cause an infinite loop of rerenders if we add it as a dependency as is - on each render the new object literal is a different reference to an object.

I think we can solve it by using useRef and using deep equals to check if the value actually changed - if we even need to fix this issue.
For now I refactored the usePresence hook a bit, it still has a eslint-disable-next-line react-hooks/exhaustive-deps, but at least with a comment now explaining how it influences things.

This was the behavior before and I don't remember seeing issues raised by users regarding this problem, so we can solve it later.
Created #1688 for this.

[ttypic]

Looks good, left small comment

[owenpearson]

LGTM 👍