Jason Connection metadata (#27)

[evdokimovs]

Part of #27

Synopsis

Add remote MemberId information to the Jason's Connection.

Also, in this PR Connection will start represent connection between Members rather than between Peers.

Solution

Add Connection.get_remote_member_id function and send remote MemberId in the PeerCreated event.

Checklist

• Created PR:
  • [x] In draft mode
  • [x] Name contains WIP: 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] WIP: prefix is removed
  • [x] All temporary labels are removed

[evdokimovs]

FCM

Jason Connection metadata (#124, #27)

- replace 'Connection.get_remote_id' with 'Connection.get_remote_member_id'
- change 'sender' and 'receivers' in Direction to contain remote MemberId instead of PeerId

Additionally:
- upgrade Firefox to 79.0 version for E2E tests