### What
Move inline OAS requestBody schema declaration under their respective class-validator classes in order to expose them through `#/components/schemas`. Replace inline OAS requestBody schema with a `$ref` reference pointing to the newly declared schema.
### Why
Having requestBody declared as its own "named" schema will allow OAS code generators to output typed entities/DTO that can be manipulate without having to reference the route/operation.
### How
Declare a new @schema JSDoc for each class-validator used to parse and validate request body. Move the current inline requestBody to the new @schema.
### Test
- Ran OAS validator.
- Ran docs build script.
Expect no visible changes to the documentation.
### Out-of-scope
requestBody of type `multipart/form-data` used for file uploads. These will be address as part of CORE-934
- [create-upload.ts](58d23a7b45/packages/medusa/src/api/routes/admin/uploads/create-upload.ts (L87-L90))
- [create-protected-upload.ts](58d23a7b45/packages/medusa/src/api/routes/admin/uploads/create-protected-upload.ts (L87-L90))
Path Parameter and Query Parameter. These will need more research and experimentation, part of CORE-931
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Resolves CORE-853
b700c6ba5b