feat: [VID-315] allow filtering participants using filter object

[myandrienko]

This PR adds support for filtering participants using a filter object instead of a predicate. Filter object looks something like this:

// Render video only from pinned participants
// or participants with the role "presenter"
{
  $or: [
    { isPinned: true },
    { roles: { $contains: 'presenter' } },
  ],
}

(For more examples of what kinds of operators we allow, see filters.test.ts.)

Filtering is supported for a subset of participant properties:

• userId: string
• isSpeaking: boolean
• isDominantSpeaker: boolean
• name: string
• roles: string[]
• isPinned: boolean

SpeakerLayout and PaginatedGridLayout now accept filter objects in their filterParticipants prop:

<SpeakerLayout
  filterParticipants={{
    $or: [
      { roles: { $contains: 'student' } },
      { isPinned: true },
    ],
  }}
/>

This is particularly useful for the composite app, because a filter object (unlike a predicate) can be passed in configuration. So the new optional configuration option is added to the composite app: participant.filter. It is supported by built-in layouts.