fix(medusa): import and use RequestQueryFields from types package (#7275)

Noticed that `RequestQueryFields` is defined in both the `medusa` and `types` package. Within the `medusa` package sometimes it uses the local type definition or the definition in `types`.

This PR removes the type definition of `RequestQueryFields` in `medusa` and uses that in `types` instead.

.changeset/gorgeous-fireants-share.md

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+---
+"@medusajs/medusa": patch
+---
+
+fix(medusa): import and use `RequestQueryFields` from types package