Theta2 next-day results

[morcuended]

This PR adds several functions to produce theta2 from DL2 files based on https://github.com/cta-observatory/2022_01_lstchain_school/blob/main/DL1b_to_Dl2/Explore_DL2_data.ipynb

Plots are produced per source for each night and the results are uploaded to the lst1 internal webpage.

[codecov]

Codecov Report

Merging #89 (057c2b6) into main (1d0a239) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
- Coverage   81.49%   81.40%   -0.10%     
==========================================
  Files          41       41              
  Lines        4307     4307              
==========================================
- Hits         3510     3506       -4     
- Misses        797      801       +4     

Impacted Files	Coverage Δ
osa/utils/utils.py	67.13% <0.00%> (-1.41%)	⬇️
osa/utils/tests/test_utils.py	97.72% <0.00%> (-1.14%)	⬇️

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[morcuended]

I will merge this and test it. Probably we might want to use the post_dl2 analysis script from lstchain or even gammapy to produce the theta2 and signal significance quick results.