Knocking support (allow it, setting it as join rule, adding aliases to knocking rooms, allow translating the word "knock")

[krille-chan]

Description

Room version 7 in Matrix 1.1 allows knocking and using that in some rooms, I would like FluffyChat to support it.

• https://spec.matrix.org/latest/rooms/v7/
• https://spec.matrix.org/latest/client-server-api/#knocking-on-rooms
• ?action=knock in Matrix URI scheme

[github-actions]

This issue is stale because it has been open for 120 days with no activity.

[Mikaela]

I could use this alongside #480

[github-actions]

This issue is stale because it has been open for 120 days with no activity.

[Mikaela]

I am still using knock_restricted in production