fix: Add Clang warning flag to suppress 64-to-32 bit conversion warnings

[OmarDuran]

Adds -Wno-shorten-64-to-32 to Clang warning flags to suppress noisy 64-to-32 bit conversion warnings while keeping other strict checks enabled.

This PR is connected with issue #3893

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.94%. Comparing base (c508d6e) to head (f4a0cbe).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3892   +/-   ##
========================================
  Coverage    58.94%   58.94%           
========================================
  Files         1326     1326           
  Lines       109524   109524           
========================================
+ Hits         64557    64559    +2     
+ Misses       44967    44965    -2     

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[rrsettgast]

We shouldn't do this. We should fix the problem instead. Can you output an example of the warnings? I don't see them on my Mac. If the operations is OK, i.e. our integer_conversion routines, then we can isolate the warning suppression with pragmas