adjustments to plot high resolution streams with FastEval

[iluise]

Description

The PR contains the following updates, useful to better visualize high resolution data (CERRA, N320 etc..):

• Restructure the plotting folder. New structure containing one file per class:

bar_plots.py (class BarPlots)
line_plots.py (class LinePlots)
score_cards.py (class ScoreCards)
quantile_plots.py (class QuantilePlots)
plotter (class LinePlots)
plot_utils.py (helpers)
plot_orchestration.py (controls the plotting)

• implement datashader for plotting instead of matplotlib (possible useful alternative for high resolution data). use_datashader = true in global_plotting_opts to enable it.
• add the possibility to define custom colors for the ratio_plots and summary_plots for each run_id
• automatically adjust marker_size and fig_size for high resolution data

N320 pred (healpix artifacts are now more visible)

CERRA (from a screenshot. quality is not that good after uploading, but it gives an idea. )

Issue Number

Closes #2253
Closes #2255

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Checklist before asking for review

• I have performed a self-review of my code
• My changes comply with basic sanity checks:
  • I have fixed formatting issues with ./scripts/actions.sh lint
  • I have run unit tests with ./scripts/actions.sh unit-test
  • I have documented my code and I have updated the docstrings.
  • I have added unit tests, if relevant
• I have tried my changes with data and code:
  • I have run the integration tests with ./scripts/actions.sh integration-test
  • (bigger changes) I have run a full training and I have written in the comment the run_id(s): launch-slurm.py --time 60
  • (bigger changes and experiments) I have shared a hegdedoc in the github issue with all the configurations and runs for this experiments
• I have informed and aligned with people impacted by my change:
  • for config changes: the MatterMost channels and/or a design doc
  • for changes of dependencies: the MatterMost software development channel