feat: Support to log in using a device code

[kilimnik]

This implements the authentication via device codes. As the authentication process is similar to the QR code authentication, I used the methods provided there.

I tried my best writing the code, though I'm rather new to Rust, so I hope it's acceptable or at least not so bad that it's not fixable ;).

• Public API changes documented in changelogs (optional)

Signed-off-by: Daniel Kilimnik daniel@neoydme.io

[codecov]

Codecov Report

Attention: Patch coverage is 89.33333% with 8 lines in your changes missing coverage. Please review.

Project coverage is 85.44%. Comparing base (e37ad11) to head (cae409b).
Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
...matrix-sdk/src/authentication/device_code/login.rs	88.33%	7 Missing ⚠️
...ates/matrix-sdk/src/authentication/qrcode/login.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4518      +/-   ##
==========================================
+ Coverage   85.36%   85.44%   +0.07%     
==========================================
  Files         284      285       +1     
  Lines       31886    31951      +65     
==========================================
+ Hits        27219    27299      +80     
+ Misses       4667     4652      -15     

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