Fce 394/track middleware

[czerwiukk]

Description

Adds track middleware to screenshare and video/audio managers.
Additionally, the track manager has been rewritten from a class to react hook.

Motivation and Context

Track middleware allows easy manipulation of the tracks managed by the SDK before streaming them out.

I also rewritten the track manager to a hook, because I needed a state to store the middleware.
Adding a property to the TrackManager class wasn't enough, I also needed to synchronize with the react state.
Instead of pursuing the event emitting pattern, I decided to introduce an internal hook.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

[linear]

FCE-394 Implement track middleware