feat(sdk): Expose Client::server_versions publicly

[zecakeh]

We have one specific use case at the moment for this in Fractal, to build the UIAA fallback URL depending on the Matrix version. Currently we always use the r0 version that is hardcoded in our code.

But I also don't see why it should not be public.

• Public API changes documented in changelogs (optional)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.39%. Comparing base (e37ad11) to head (83f53a8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4519      +/-   ##
==========================================
+ Coverage   85.36%   85.39%   +0.03%     
==========================================
  Files         284      284              
  Lines       31886    31886              
==========================================
+ Hits        27219    27229      +10     
+ Misses       4667     4657      -10     

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[poljar]

Thanks, indeed should be public.