Create generic externals apptype

[elitonzky]

No description provided.

[codecov]

Codecov Report

Merging #283 (980d8d3) into main (e7b6471) will increase coverage by 0.86%.
The diff coverage is 96.50%.

@@            Coverage Diff             @@
##             main     #283      +/-   ##
==========================================
+ Coverage   79.43%   80.30%   +0.86%     
==========================================
  Files          74       77       +3     
  Lines        2670     2813     +143     
==========================================
+ Hits         2121     2259     +138     
- Misses        549      554       +5     

Flag	Coverage Δ
annotations	80.30% <96.50%> (+0.86%)	⬆️
path	80.30% <96.50%> (+0.86%)	⬆️
test_changes	80.30% <96.50%> (+0.86%)	⬆️

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Impacted Files	Coverage Δ
...tplace/core/types/externals/generic/serializers.py	87.80% <87.80%> (ø)
marketplace/core/types/externals/generic/type.py	100.00% <100.00%> (ø)
marketplace/core/types/externals/generic/views.py	100.00% <100.00%> (ø)