Implementation of MSC3824 actions for compat

[hughns]

No description provided.

[sandhose]

Nitpicks, but overall LGTM

[codecov-commenter]

Codecov Report

Merging #221 (32153cf) into main (0a32ba3) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head 32153cf differs from pull request most recent head d1b49cf. Consider uploading reports for the commit d1b49cf to get more accurate results

@@            Coverage Diff             @@
##             main     #221      +/-   ##
==========================================
- Coverage   21.63%   21.62%   -0.01%     
==========================================
  Files         129      129              
  Lines        9661     9665       +4     
==========================================
  Hits         2090     2090              
- Misses       7571     7575       +4     

Impacted Files	Coverage Δ
crates/handlers/src/compat/login.rs	0.00% <0.00%> (ø)

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