Sliding Sync timeline events and extensions

[gnunicorn]

• [x] general extensions framework
  • [x] still needs a ruma patch to complete first, refs https://github.com/ruma/ruma/pull/1273
• [x] E2EE Extension support
• [x] ToDevice Extension support
• [x] AccountData Extension support
• [x] Timeline events support

refs #1014

[jplatte]

I have just released ruma 0.7.4 with the sliding sync changes.

[codecov[bot]]

Codecov Report

Base: 73.17% // Head: 73.17% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (773b587) compared to base (9de98df). Patch coverage: 80.55% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1054   +/-   ##
=======================================
  Coverage   73.17%   73.17%           
=======================================
  Files         110      110           
  Lines       12256    12265    +9     
=======================================
+ Hits         8968     8975    +7     
- Misses       3288     3290    +2     

Impacted Files	Coverage Δ
...es/matrix-sdk-common/src/deserialized_responses.rs	62.16% <ø> (ø)
crates/matrix-sdk/src/sliding_sync.rs	0.00% <0.00%> (ø)
crates/matrix-sdk-base/src/client.rs	77.33% <88.46%> (+0.30%)	:arrow_up:
crates/matrix-sdk-crypto/src/machine.rs	66.83% <100.00%> (-0.18%)	:arrow_down:
crates/matrix-sdk/src/sync.rs	71.42% <100.00%> (+2.46%)	:arrow_up:

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[poljar]

Seems like the proxy has an issue with one-time key counts, opened https://github.com/matrix-org/sliding-sync/issues/52 for that.

[poljar]

And another, rather critical issue: https://github.com/matrix-org/sliding-sync/issues/53