PR to reduce warnings/notifications

[jdebacker]

This PR does three things:

• Updates the method to read the JSON parameters file that is packaged with OG-ZAF in order to avoid deprecation warnings (this applies to 5 example run scripts)
• Creates a function to read the default SAM file, which mean that the default SAM file will not be read in unless one is updating the input-output parameters. As it is currently, this file is read in anytime the ogzaf package is imported.
• Modifies setup.py to make sure both the representative firm and multi-sector calibration JSON files are packaged with ogzaf

[codecov]

Codecov Report

Attention: Patch coverage is 79.31034% with 6 lines in your changes missing coverage. Please review.

Project coverage is 59.86%. Comparing base (534e97d) to head (a56e3e1).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
ogzaf/input_output.py	68.42%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #89       +/-   ##
===========================================
+ Coverage   42.95%   59.86%   +16.90%     
===========================================
  Files          12       12               
  Lines         426      431        +5     
===========================================
+ Hits          183      258       +75     
+ Misses        243      173       -70     

Flag	Coverage Δ
unittests	59.86% <79.31%> (+16.90%)	⬆️

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