Krille/refactor-archive-room-handling

[krille-chan]

closes #2031

Test out with:

Client(
  // ...
 syncFilter: Filter(
    room: RoomFilter(
      includeLeave: true,
      state: StateFilter(lazyLoadMembers: true),
    ),
  ),
);

If you don't change the syncFilter, the behavior should be as before, just that you now have to cache the archive by yourself when requesting it.

[codecov]

Codecov Report

❌ Patch coverage is 73.68421% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.41%. Comparing base (4123392) to head (4f2d4cf).

Files with missing lines	Patch %	Lines
lib/src/client.dart	75.00%	9 Missing ⚠️
lib/src/database/matrix_sdk_database.dart	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2217      +/-   ##
==========================================
- Coverage   59.49%   59.41%   -0.09%     
==========================================
  Files         161      161              
  Lines       20127    20107      -20     
==========================================
- Hits        11974    11946      -28     
- Misses       8153     8161       +8     

Files with missing lines	Coverage Δ
lib/src/room.dart	77.54% <ø> (+0.26%)	⬆️
lib/src/database/matrix_sdk_database.dart	89.96% <50.00%> (-1.54%)	⬇️
lib/src/client.dart	77.72% <75.00%> (-0.05%)	⬇️

... and 1 file with indirect coverage changes

---

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