Add reading of calibration files in fits format

[FrancaCassol]

This is necessary in order to move to fits output as requested by EvB

[codecov]

Codecov Report

Attention: Patch coverage is 95.89041% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.03%. Comparing base (0bfa981) to head (c0a19ac).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ctapipe_io_lst/calibration.py	94.11%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
+ Coverage   90.97%   91.03%   +0.05%     
==========================================
  Files          25       25              
  Lines        2637     2688      +51     
==========================================
+ Hits         2399     2447      +48     
- Misses        238      241       +3     

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[maxnoe]

You need to rebase or merge with main.

This also needs tests with the fits files produced by lstcam-calib.

[FrancaCassol]

You need to rebase or merge with main.

it tells it is already up to date

[maxnoe]

This only tests the case where the array is not yet native and it also doesn't verify that the values are actually correct.

[maxnoe]

You need to rebase or merge with main.

it tells it is already up to date

Ah, sorry, right. The fix for the CI is not yet merged, this PR is needed, please review:
#237

[FrancaCassol]

This also needs tests with the fits files produced by lstcam-calib.

@maxnoe, I need to add fits calibration and drs4 baseline files, but it seems that that the other test data are in lstchain, what do you suggest to do?

[FrancaCassol]

I decided at the end to create only one test for all parameters