### What
Unhandled OAS circular references shall fail `openapi:generate` until they have been patched in `docs-util/redocly/config.yaml`
### Why
Prevent developers to commit new OAS changes that would cause to API documentation to crash.
Our API documentation rendering library will crash and not load if our OAS contains circular references. We have an automated mechanism to patch offending references but they must be identified and configured by hand.
### How
Let the `openapi:generate --dry-run` command reach OAS sanitization and circular reference check operations.
Fail the build script if unhandled circular references are detected.
Output the offending references to the stdout in order to help the developers identify and configure the required patch.
Since some the tooling involved only work with files, use the host system's temporary directory mechanism when using the `--dry-run` flag.
### Test
* Introduce a bug by removing an entry in `docs-util/redocly/config.yaml`
* Run `yarn openapi:generate --dry-run`
* Expect the script to exit before completing
* Expect the logs to contain `🔴 Unhandled circular references.`
* Expect the logs to contain an array of the offending references
## 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](0adb0d9ff9/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`.
