Operate hashed Member credentials (#165, #27)

[evdokimovs]

Part of #27
Fixes #165

Synopsis

We need to implement ability to check Member' s credentials by Argon2 hash provided by Control API.

Solution

Algorithm described in the #165.

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

Operate hashed Member credentials (#168, #165, #27)

- add ability to specify credentials hash in Control API
- implement Web Client credentials verification via Argon2 hash received from Control API
- change Join URI format to: {{ Host }}/{{ Room ID }}/{{ Member ID }}?token={{ Token }}