Adds positive int trait

Created by: stefanoborini

Required to identify exclusively positive values in the models.

Created by: codecov[bot]

Codecov Report

Merging #164 into master will increase coverage by 0.36%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #164      +/-   ##
=========================================
+ Coverage   92.33%   92.7%   +0.36%     
=========================================
  Files          42      42              
  Lines         966    1247     +281     
  Branches       67      91      +24     
=========================================
+ Hits          892    1156     +264     
- Misses         70      87      +17     
  Partials        4       4

Impacted Files	Coverage Δ
force_bdss/api.py	100% <100%> (ø)
force_bdss/local_traits.py	100% <100%> (ø)
force_bdss/data_sources/i_data_source_factory.py	73.91% <0%> (-3.87%)
force_bdss/ui_hooks/i_ui_hooks_factory.py	78.94% <0%> (-1.06%)
...orce_bdss/data_sources/base_data_source_factory.py	100% <0%> (ø)
..._bdss/mco/parameters/base_mco_parameter_factory.py	100% <0%> (ø)
...on_listeners/base_notification_listener_factory.py	100% <0%> (ø)
force_bdss/ui_hooks/base_ui_hooks_factory.py	100% <0%> (ø)
force_bdss/mco/base_mco_factory.py	98.41% <0%> (+1.63%)
... and 3 more

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