Add external API and OAuth 2.0

[samuelwei]

Partially Implements #3102

Type

• Bugfix
• Feature
• Documentation
• Refactoring (e.g. Style updates, Test implementation, etc.)
• Other (please describe):

Checklist

• Code updated to current develop branch head
• Passes CI checks
• Is a part of an issue
• Tests added for the bugfix or newly implemented feature, describe below why if not
• Changelog is updated
• Documentation of code and features exists

Changes

• Add OAuth 2.0: Authorization Code Flow
• Add external API
  • Get user profile data
  • Get list of own rooms
  • Create new room

Other information

This PR is currently a PoC used in a separate project building a basic Thunderbird Addon

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