Tor bridges support: complete phase one

(Parent ticket.)

Parent Task: #5479 (closed)

Subtasks

• #5287 (closed)
• #5305 (closed)
• #6843 (closed)
• #6882 (closed)
• #6885 (closed)
• #6934 (closed)
• #6935 (closed)

Related issues

• Related to #5343 (closed)
• Blocks #6839 (closed)

Original created by @tails on 5920 (Redmine)