refactor(FlopyBinaryData): use properties, deprecate set_float

[wpbonelli]

Minor cleanup. Use properties instead of attributes. Deprecate set_float() and replace usages with precision setter.

[codecov]

Codecov Report

Attention: Patch coverage is 93.54839% with 4 lines in your changes missing coverage. Please review.

Project coverage is 76.3%. Comparing base (bb9824e) to head (42f6b71).
Report is 36 commits behind head on develop.

Files with missing lines	Patch %	Lines
flopy/utils/utils_def.py	90.2%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #2421     +/-   ##
=========================================
+ Coverage     68.4%   76.3%   +7.8%     
=========================================
  Files          294     294             
  Lines        59390   59855    +465     
=========================================
+ Hits         40652   45690   +5038     
+ Misses       18738   14165   -4573     

Files with missing lines	Coverage Δ
flopy/mf6/utils/binarygrid_util.py	92.2% <100.0%> (+0.3%)	⬆️
flopy/utils/observationfile.py	89.0% <100.0%> (+0.1%)	⬆️
flopy/utils/swroutputfile.py	96.1% <100.0%> (+<0.1%)	⬆️
flopy/utils/utils_def.py	85.9% <90.2%> (+5.7%)	⬆️

... and 244 files with indirect coverage changes