Multiverse: add create encrypted room

[davidegirardi]

Add a command to create encrypted rooms. There's a bit of duplicate code from the CreateRoom mode but I think it's ok. Open to comments of course.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.89%. Comparing base (1f2b4f8) to head (c38a9f4).
⚠️ Report is 24 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5615   +/-   ##
=======================================
  Coverage   88.89%   88.89%           
=======================================
  Files         345      345           
  Lines       95800    95800           
  Branches    95800    95800           
=======================================
+ Hits        85158    85165    +7     
+ Misses       6655     6647    -8     
- Partials     3987     3988    +1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #5615 will improve performances by 48.14%

_{Comparing davidegirardi:dg/multiverse-create-encrypted-room (c38a9f4) with main (472b934)}

Summary

⚡ 1 improvements
✅ 48 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	Restore session [memory store]	403.3 ms	272.2 ms	+48.14%

[poljar]

While this approach is completely fine for a hackaton, I think we'll want to reuse the existing command and view to be able to pick if a room should be encrypted or not.

Basically we'll want to recreate what Element or other real clients do:

A, by default on, toggle switch to enable/disable encryption in the room.