feat(oas): medusa-oas-cli as OAS build tool (#3213)

## What

Introduce a CLI for extracting OAS from the core `medusa` package.

## Why

We need to decouple OAS tooling from documentation tooling in order to allow packages and external systems to leverage our OAS has a dependency.

## How

Introduce a new OAS workspace within packages in order to organize current and future OAS related package. Only 1 OAS package for now.

Introduce a new CLI only package to act as the main gateway for all upcoming OAS tooling. Only 1 command for now.

Update documentation tooling pertaining to OAS to use the CLI instead.

## Test

### Prerequisite
From the monorepo root:
* `yarn install`
* `yarn build`

### Documentation

#### Case - validation only - success
* Run `yarn openapi:generate --dry-run`
* Expect console output `🟢 Valid OAS` but no mention of `🔵 Exported OAS`

#### Case - validation only - invalid
* Introduce a bug by renaming `@schema Cart` to `@schema Kart` in [models/cart.ts](https://github.com/medusajs/medusa/blob/0adb0d9ff96087613b7a634cbc97a7e301b01121/packages/medusa/src/models/cart.ts#L2)
* Run `yarn build` to update `@medusajs/medusa` package with the bug.
* Run `yarn openapi:generate --dry-run`
* Expect console output `🔴 Invalid OAS` with a stack trace of the issue.

#### Case - docs generation
* Run `yarn openapi:generate`
* Expect `docs/api/` directory to contain:
  * `admin.oas.json` (raw OAS)
  * `store.oas.json` (raw OAS)
  * `admin.oas.yaml` (sanitized OAS)
  * `store.oas.yaml` (sanitized OAS)
  * `admin/` (updated redocly split output)
  * `store/` (updated redocly split output)

### CLI

#### Case - crawl additional paths
* From a local medusa server (`medusa-starter-default`), add an `index.ts` file in `src/models/`
* In the `index.ts`, add dummy OAS JSDoc like `/** @schema Foobar */`
* From the root of the monorepo, run `yarn medusa-oas --type store --paths path-to-medusa-server/src`
* Expect a `store.oas.json` to be created at the root of the monorepo.
* The `store.oas.json` should contain an additional `Foobar` entry in `components.schemas`.

package.json

@@ -4,6 +4,7 @@
   "workspaces": {
     "packages": [
       "packages/*",
+      "packages/oas/*",
       "integration-tests/**/*"
     ]
   },
@@ -19,6 +20,8 @@
     "@babel/preset-react": "^7.18.6",
     "@babel/register": "^7.11.5",
     "@babel/runtime": "^7.11.2",
+    "@medusajs/medusa-oas-cli": "*",
+    "@readme/openapi-parser": "^2.4.0",
     "@redocly/cli": "1.0.0-beta.123",
     "@typescript-eslint/eslint-plugin": "^5.36.2",
     "@typescript-eslint/parser": "^5.36.2",
@@ -33,11 +36,13 @@
     "eslint-plugin-markdown": "^3.0.0",
     "eslint-plugin-prettier": "^4.2.1",
     "eslint-plugin-react": "^7.31.11",
+    "execa": "^5.1.1",
     "express": "^4.17.1",
     "get-port": "^5.1.1",
     "husky": "^7.0.4",
     "import-from": "^3.0.0",
     "jest": "^26.6.3",
+    "js-yaml": "^4.1.0",
     "lint-staged": "^11.2.6",
     "microbundle": "^0.13.3",
     "pg-god": "^1.0.12",
@@ -89,9 +94,7 @@
     "@linear/sdk": "^1.22.0",
     "@octokit/core": "^4.0.5",
     "global": "^4.4.0",
-    "import-from": "^3.0.0",
-    "oas-normalize": "^5.0.1",
-    "swagger-inline": "^3.2.3"
+    "import-from": "^3.0.0"
   },
   "packageManager": "yarn@3.2.1"
 }