feature: add idempotency to create product API

[ran-isenberg]

Summary

• add idempotency to create product API
• added e2e tests
• removed duplicate product model definition

User experience

If applicable, please share what the user experience looks like before and after this change

Checklist

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• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[ran-isenberg]

@heitorlessa pretty sure this is an idempotency issue. i had to do an ugly inner import trick

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (2dd0cef) 97.95% compared to head (27cf9da) 98.30%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   97.95%   98.30%   +0.35%     
==========================================
  Files          34       32       -2     
  Lines         537      532       -5     
==========================================
- Hits          526      523       -3     
+ Misses         11        9       -2     

Files	Coverage Δ
product/crud/domain_logic/create_product.py	100.00% <100.00%> (ø)
product/crud/domain_logic/delete_product.py	100.00% <100.00%> (ø)
product/crud/domain_logic/get_product.py	100.00% <100.00%> (ø)
product/crud/domain_logic/list_products.py	100.00% <100.00%> (ø)
product/crud/handlers/constants.py	100.00% <100.00%> (ø)
product/crud/handlers/handle_create_product.py	100.00% <100.00%> (ø)
product/crud/handlers/handle_delete_product.py	100.00% <100.00%> (ø)
product/crud/handlers/handle_get_product.py	100.00% <100.00%> (ø)
product/crud/handlers/handle_list_products.py	100.00% <100.00%> (ø)
product/crud/handlers/utils/rest_api_resolver.py	100.00% <100.00%> (ø)
... and 7 more

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