Add configuration option to choose which cleaning to use to get training data

[HealthyPear]

The previous situation was one in which both cleanings were computed and recorded

• biggest (meaning biggest cluster)
• extended (meaning all clusters)

but the one used for image quality and shower geometry was always the one using the biggest cluster.

In accordance with #117, now it will be possible to choose between the 2 from analysis.yaml (under ImageSelection/source), and the default option is set to be "extended".

[codecov]

Codecov Report

Merging #135 (6fa1a9b) into master (b1e0a9d) will decrease coverage by 0.16%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
- Coverage   60.36%   60.20%   -0.17%     
==========================================
  Files          23       23              
  Lines        2122     2141      +19     
==========================================
+ Hits         1281     1289       +8     
- Misses        841      852      +11     

Impacted Files	Coverage Δ
protopipe/pipeline/event_preparer.py	68.05% <60.00%> (-1.84%)	⬇️

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