chore(oas): explicitly declare type:object on schemas with properties (#2712)

### What

OAS: Explicitly declare type:object on schemas with properties.

### Why

While not officially required, schemas with properties should have their type explicitly declared as "object". Omitting the type translates to type: any with properties XYZ. The ambiguity can lead to issues when using code generators.

### How

Multiple regex searches to identify schemas missing type: object. Manually edit each schema. Spot check generated OAS.

### Testing
- Ran OAS validator.
- Ran docs build script

### Proof
![Screen Shot 2022-12-01 at 1 46 13 PM](https://user-images.githubusercontent.com/116003638/205137671-7a6770dd-4f9b-456c-99a6-ac654f6d0f59.png)


RESOLVES CORE-847

packages/medusa/src/api/routes/admin/auth/create-session.ts

@@ -20,6 +20,7 @@ import { validator } from "../../../../utils/validator"
  *   content:
  *     application/json:
  *       schema:
+ *         type: object
  *         required:
  *           - email
  *           - password
@@ -61,6 +62,7 @@ import { validator } from "../../../../utils/validator"
  *    content:
  *      application/json:
  *        schema:
+ *          type: object
  *          properties:
  *            user:
  *              $ref: "#/components/schemas/user"