feat: add setup Pact on project

[mefellows]

What's changed?

Adds Pact tests for deleteProduct() method.

Coverage Report 📈

File	Endpoint	Method	Scenario	Status
src/api.js	/product/:id	DELETE	given a valid product, returns 200	✅
src/api.js	/product/:id	DELETE	given an invalid ID, returns 400	✅
src/api.js	/product/:id	DELETE	given unauthorized access, returns 401	✅
src/api.js	/product/:id	DELETE	given a non-existent product, returns 404	✅
src/api.js	/products	GET	given products exist, returns 200	✅
src/api.js	/products	GET	given an empty product list, returns 204	✅
src/api.js	/products	GET	returns 400 for a bad request	✅
src/api.js	/products	GET	returns 401 for unauthorized access	✅
src/api.js	/products	GET	returns 404 for not found	✅
src/api.js	/product/:id	GET	given a valid product, returns 200	✅
src/api.js	/product/:id	GET	given an invalid ID, returns 400	✅
src/api.js	/product/:id	GET	given a non-existent product, returns 404	✅
src/api.js	/product/:id	GET	given unauthorized access, returns 401	✅