feat(repo): add fastify api via netlify functions

[barbados-clemens]

add a netlify function for each app (cart & products) instead of using an hard coded data inside the app

Note:
e2e aren't working due to issues with cypress and run-command executors.

[nx-cloud]

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✅ Successfully ran 3 targets

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• nx affected:test --base 6f240036175361269a49e1c3a76abcc02c7a9f22 --parallel -- --ci --code-coverage
• nx affected:lint --base 6f240036175361269a49e1c3a76abcc02c7a9f22 --parallel

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[netlify]

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