Introduce output info class to support KPI flag

Created by: stefanoborini

Introduces the OutputSlotInfo to support the marking of KPIs without relying on KPICalculators.

Created by: codecov[bot]

Codecov Report

Merging #117 into master will increase coverage by 0.08%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
+ Coverage   94.14%   94.22%   +0.08%     
==========================================
  Files          38       39       +1     
  Lines         786      797      +11     
  Branches       58       61       +3     
==========================================
+ Hits          740      751      +11     
  Misses         39       39              
  Partials        7        7

Impacted Files	Coverage Δ
force_bdss/kpi/base_kpi_calculator_model.py	100% <100%> (ø)
force_bdss/data_sources/base_data_source_model.py	100% <100%> (ø)
force_bdss/core_evaluation_driver.py	86.41% <100%> (ø)
force_bdss/core/output_slot_info.py	100% <100%> (ø)
force_bdss/io/workflow_reader.py	100% <100%> (ø)
force_bdss/core_mco_driver.py	90.9% <100%> (ø)

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