Implement state synchronization on reconnection (#27, #47)

[evdokimovs]

Part of #27, #47

Requires #164

Synopsis

We need to synchronize Web Client's State with a Media Server State on RPC connection restore.

Solution

• [x] Implement Command::SynchronizeMe and Event::StateSynchronized
• [x] Apply Media Server State on RPC connection restore
• [x] Print Web Client's State to the debug log on Media Server side
• [x] Send Web Client's intentions after State synchronization

Checklist

• Created PR:
  • [x] In draft mode
  • [x] Name contains Draft: prefix
  • [x] Name contains issue reference
  • [x] Has k:: labels applied
  • [x] Has assignee
• [x] Documentation is updated (if required)
• [x] Tests are updated (if required)
• [x] Changes conform code style
• [x] CHANGELOG entry is added (if required)
• [x] FCM (final commit message) is posted
  • [x] and approved
• [x] Review is completed and changes are approved
• Before merge:
  • [x] Milestone is set
  • [x] PR's name and description are correct and up-to-date
  • [x] Draft: prefix is removed
  • [x] All temporary labels are removed

[evdokimovs]

FCM

Implement State synchronization on reconnect (#167, #27, #47)

- add SynchronizeMe Command
- add StateSynchronized Event
- implement Client intentions send on RPC reconnect

Additionally:
- add FromIterator implementation for a ObservableHashMap in 'medea-reactive' crate

[evdokimovs]

FCM

Implement state synchronization on reconnection (#167, #27, #47)

- add states for client and sever synchronization to 'medea-client-api-proto' crate
- add Event::StateSynchronized and Command::SynchronizeMe to 'medea-client-api-proto` crate
- implement state synchronization on reconnection in 'medea-jason' and 'medea' crates

Additionally:
- upgrade Firefox to 85.0 version for E2E tests