Introduced base class for the bundles.

Created by: stefanoborini

Instead of delegating the need to define the traits interface to the plugin author, use a base class to define the @provides details and let the plugin developers just use the base class.

Fixes #36 (closed)

Created by: codecov-io

Codecov Report

Merging #37 into master will increase coverage by 3.49%. The diff coverage is 66.03%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   45.06%   48.56%   +3.49%     
==========================================
  Files          38       41       +3     
  Lines         486      521      +35     
  Branches       29       29              
==========================================
+ Hits          219      253      +34     
- Misses        258      259       +1     
  Partials        9        9

Impacted Files	Coverage Δ
force_bdss/data_sources/i_data_source_bundle.py	100% <ø> (+14.28%)
...re_plugins/dummy_kpi/kpi_adder/kpi_adder_bundle.py	0% <0%> (ø)
force_bdss/api.py	0% <0%> (ø)
...dss/core_plugins/dummy_mco/dakota/dakota_bundle.py	0% <0%> (ø)
...sv_extractor/csv_extractor/csv_extractor_bundle.py	0% <0%> (ø)
force_bdss/kpi/i_kpi_calculator_bundle.py	75% <100%> (+3.57%)
...orce_bdss/mco/i_multi_criteria_optimizer_bundle.py	70% <100%> (+3.33%)
force_bdss/kpi/base_kpi_calculator_bundle.py	100% <100%> (ø)
...e_bdss/mco/base_multi_criteria_optimizer_bundle.py	100% <100%> (ø)
force_bdss/data_sources/base_data_source_bundle.py	100% <100%> (ø)
... and 3 more

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