Arktype plugin

Please vote on this issue if you're interested in [Arktype](https://arktype.io/) [plugin](https://heyapi.dev/openapi-ts/plugins/arktype).

This issue will serve as a to-do list during development. To help us release this feature as quickly as possible, feel free to share the minimum requirements for your use case.

#### TODO

- [ ] add implementation
- [ ] add documentation
- [ ] add tests