Include parameters in recipe to let users choose which data to save/plot

This was requested in #27 (closed)

Opening this issue to keep track of the potentials ways we can handle this.

TODOs (Saving):

• Anomalies
• Calibration
• Skill
• Probabilities
• Downscaling
• Visualization
• Change unit tests
• Update recipes

TODOs (Visualization):

• Update recipes

Other tasks:

• Update recipe checker

Saving Option 1: Including parameters inside the configuration of every module

  Workflow:
    Anomalies:
      compute: yes
      cross_validation: yes 
    Calibration:
      method: raw
      save_experiment: yes/no # saves hcst/fcst
      save_observations: yes/no # saves the corresponding observations
    Skill:
      metric: RPSS CRPSS EnsCorr
      save_metrics: yes/no # save the skill metrics
    Probabilities:
      percentiles: [[1/3, 2/3], [1/10, 9/10]]
      save_probabilities: yes/no
      save_percentiles: yes/no 
# ... etc

Potential issues: ensuring flexibility and consistency if Anomalies are computed, given that the user has the option to compute them before or after the Calibration step.

Saving Option 2: Adding a Saving section inside 'Workflow':

  Workflow:
    # (...)
    Saving:
      outputs: skill # possibilities: skill, experiment, observations, probabilities, percentiles
      ## Add possible options for significance?
# ... etc

Potential issues: Not as user-friendly and clear as Option 1

Visualization Option 1: Adding a Visualization section inside 'Workflow':

  Workflow:
    # (...)
    Visualization:
      plots: most_likely_terciles, skill # possibilities: skill, forecast_ensemble_mean, most_likely_terciles
      ## Add possible options for significance?
# ... etc