Fix issue with FoV offset binnning when using energy dependant theta cut and diffuse MC

[mdebony]

This PR fix the issue #1322 . The bloc of code managing the FoV binning as been moved too.

The PR also add a warning message if the FoV binning is wider than the simulated FoV, and restrict the gammas used for the computation of energy dependant cuts (gh and theta) to the ones within the FoV range considered for the IRF.

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 73.51%. Comparing base (9aaa78b) to head (28ce7b4).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
lstchain/tools/lstchain_create_irf_files.py	55.55%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1328      +/-   ##
==========================================
- Coverage   73.52%   73.51%   -0.01%     
==========================================
  Files         134      134              
  Lines       14215    14215              
==========================================
- Hits        10451    10450       -1     
- Misses       3764     3765       +1     

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[mdebony]

@moralejo This is the new PR. Now test are working, but the codecov check are failling. I'm not sure what I need to change.

[moralejo]

Perhaps you can print in the log the binning (might be somewhere else, but better be explicit on what it is doing)

[mdebony]

I've added in the log line the FoV binning used.

[moralejo]

@moralejo This is the new PR. Now test are working, but the codecov check are failling. I'm not sure what I need to change.

codecov is not strictly required. I think you would have to cover a larger part of the code with CI tests