Fix EmbeddedModel generics definition with a custom key_name

[art049]

Fixes #263

TODO:

• Fix coverage
• Change spurious realworld-test implementation

[github-actions]

🚀 Deployed on https://docs-preview-269--odmantic.netlify.app

[codecov]

Codecov Report

Merging #269 (0fac238) into master (775966b) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #269    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           44        45     +1     
  Lines         4679      4884   +205     
  Branches       808       870    +62     
==========================================
+ Hits          4679      4884   +205     

Flag	Coverage Δ
tests-3.10-4.4-standalone	94.32% <99.58%> (+0.24%)	⬆️
tests-3.10-5-standalone	94.32% <99.58%> (+0.24%)	⬆️
tests-3.10-6-standalone	94.32% <99.58%> (+0.24%)	⬆️
tests-3.7-4.4-standalone	92.65% <99.58%> (+0.32%)	⬆️
tests-3.7-5-standalone	92.65% <99.58%> (+0.32%)	⬆️
tests-3.7-6-standalone	92.65% <99.58%> (+0.32%)	⬆️
tests-3.8-4-replicaSet	99.05% <99.58%> (+0.04%)	⬆️
tests-3.8-4.2-sharded	93.48% <99.58%> (+0.28%)	⬆️
tests-3.8-4.4-standalone	94.32% <99.58%> (+0.24%)	⬆️
tests-3.8-5-standalone	94.32% <99.58%> (+0.24%)	⬆️
tests-3.8-6-standalone	94.32% <99.58%> (+0.24%)	⬆️
tests-3.9-4.4-standalone	94.24% <99.58%> (+0.25%)	⬆️
tests-3.9-5-standalone	94.24% <99.58%> (+0.25%)	⬆️
tests-3.9-6-standalone	94.24% <99.58%> (+0.25%)	⬆️

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Impacted Files	Coverage Δ
odmantic/exceptions.py	100.00% <100.00%> (ø)
odmantic/field.py	100.00% <100.00%> (ø)
odmantic/model.py	100.00% <100.00%> (ø)
odmantic/typing.py	100.00% <100.00%> (ø)
tests/integration/test_embedded_model.py	100.00% <100.00%> (ø)
tests/integration/test_engine.py	100.00% <100.00%> (ø)
tests/unit/test_model_definition.py	100.00% <100.00%> (ø)
tests/unit/test_model_logic.py	100.00% <100.00%> (ø)
tests/unit/test_typing.py	100.00% <100.00%> (ø)

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