Introduces base class for plugins to simplify export

Created by: stefanoborini

Introduced a base class BaseExtensionPlugin. This class provides the base class for all plugins that are externally provided, and allows the user to just define the default methods to return their own bundles, instead of having to deal with the extension point ids.

Created by: codecov-io

Codecov Report

Merging #23 into master will increase coverage by 1.48%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   22.82%   24.31%   +1.48%     
==========================================
  Files          37       38       +1     
  Lines         403      403              
  Branches       24       24              
==========================================
+ Hits           92       98       +6     
+ Misses        306      300       -6     
  Partials        5        5

Impacted Files	Coverage Δ
...ugins/test_mco/multi_criteria_optimizers_plugin.py	0% <0%> (ø)
...core_plugins/csv_extractor/csv_extractor_plugin.py	0% <0%> (ø)
force_bdss/base_extension_plugin.py	100% <100%> (ø)
...ore_plugins/test_kpi/test_kpi_calculator_plugin.py	80% <100%> (-7.5%)

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