Add function to check a table for required cols/units

[maxnoe]

No description provided.

[codecov]

Codecov Report

Merging #75 into master will increase coverage by 0.59%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   84.68%   85.27%   +0.59%     
==========================================
  Files          34       35       +1     
  Lines        1038     1073      +35     
==========================================
+ Hits          879      915      +36     
+ Misses        159      158       -1     

Impacted Files	Coverage Δ
pyirf/exceptions.py	100.00% <100.00%> (ø)
pyirf/sensitivity.py	38.46% <100.00%> (+0.72%)	⬆️
pyirf/tests/test_utils.py	100.00% <100.00%> (ø)
pyirf/utils.py	76.47% <100.00%> (+14.56%)	⬆️

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