sdk: Improvements and fixes around media APIs

[zecakeh]

This includes 3 small commits:

1. Use the new built-in support for (un)stable feature flags in Ruma to decide on whether we will use the authenticated media endpoints, instead of having custom code in the SDK.
2. Since refactor: Add read_timeout for HTTP requests, make timeout optional #5437, the request timeout was ignored in media requests, however that didn't apply to unauthenticated media endpoints because they didn't use the modified request config. This fixes it.
3. fix(sdk): check max_upload_size before attempting to upload any media #5119 added a mandatory check when uploading files, using the allowed upload size advertised by the server at the media config endpoint. However that check only supports the authenticated media config endpoint, so users on servers that don't support authenticated media cannot send media anymore. We got a bug report because of that in Fractal, from a user using a private homeserver instance that doesn't support authenticated media. This adds support for the unauthenticated media config endpoint too.

[codspeed-hq]

CodSpeed Performance Report

Merging #5516 will not alter performance

_{Comparing zecakeh:media-fixes (1e85306) with main (e2f0b4f)}

Summary

✅ 31 untouched benchmarks

[stefanceriu]

Very nice, thank you Kevin! 👍

[codecov]

Codecov Report

❌ Patch coverage is 89.55224% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.58%. Comparing base (6c944a9) to head (1e85306).
⚠️ Report is 11 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/matrix-sdk/src/client/mod.rs	93.02%	0 Missing and 3 partials ⚠️
crates/matrix-sdk/src/media.rs	50.00%	1 Missing and 2 partials ⚠️
crates/matrix-sdk/src/config/request.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5516      +/-   ##
==========================================
+ Coverage   88.57%   88.58%   +0.01%     
==========================================
  Files         339      339              
  Lines       93627    93660      +33     
  Branches    93627    93660      +33     
==========================================
+ Hits        82927    82968      +41     
+ Misses       6565     6559       -6     
+ Partials     4135     4133       -2     

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[zecakeh]

All right, I fixed the CI.

[stefanceriu]

Beautiful, thank you!