Support $ref at path item object level

[MauroB45]

Description

Based on the openapi spec $ref is supported in the path-item-object config (see spec). When I tried generating the types for the following schema it does not generate the link correctly and the result object is empty.

openapi: "3.0"
info:
  title: test
  version: "1.0"
paths:
  /test:
    $ref: './_paths-test.yaml'
...

Proposal

Support $ref at the path item object level instead of the operation object where it is not supported (we can keep it for backward compatibility purposes).

Checklist

• I’m willing to open a PR for this (see CONTRIBUTING.md)

[drwpow]

This is a definite bug and should be fixed. Not supporting valid $refs isn’t an intentional decision.

[drwpow]

Released in v6.3.8 🎉