fix x-lint-ignore directives for non jsonpath rules

[tx3stn]

The x-lint-ignore directive is only working for JSONPath based rules and fails to ignore custom function rules that report violations at different paths than where they're queried.

oas3-api-servers uses given: $ (root query) but reports violations at $.servers path.
When servers field didn't exist, there was nowhere to place the ignore directive so you can't ignore it.
This also means any ignores at the root of the document are not respected.

Minimal example to test:

x-lint-ignore: oas3-api-servers
openapi: 3.0.3
info:
  title: Test API
  version: 1.0.0
  x-lint-ignore: info-description
paths: {}

1. run: vacuum lint spec.yaml --no-banner
2. Observe the ignored rules are still reported.
3. Rebuild with these changes.
4. Observe ignored rules are no longer reported.

[daveshanley]

clean, as always. nice!