Add concentration

[HealthyPear]

In this PR concentration is added to the output of the EventPreparer class, so it is written out to TRAINING and DL2 formats.

It is only computed for the extended image (aka with all clusters)

• because of Update standard image cleaning settings #117
• in anticipation of Implement new DL1 data format from ctapipe #25

ctapipe outputs concentration in 3 different definitions, none of which seem to coincide with the one used by CTAMARS, but we can use

concentration_pixel = image.max() / h.intensity

as a good approximation

[codecov]

Codecov Report

Merging #133 (f88d9ad) into master (9149e12) will increase coverage by 0.16%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
+ Coverage   60.30%   60.46%   +0.16%     
==========================================
  Files          23       23              
  Lines        2091     2102      +11     
==========================================
+ Hits         1261     1271      +10     
- Misses        830      831       +1     

Impacted Files	Coverage Δ
protopipe/scripts/write_dl2.py	82.45% <ø> (ø)
protopipe/pipeline/event_preparer.py	69.88% <88.88%> (+0.53%)	⬆️
protopipe/scripts/data_training.py	94.94% <100.00%> (+0.07%)	⬆️

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