Is your enhancement related to a problem? Please describe.

There are improvements that we could benefit from, such as allowing warnings to be reported on schemas instead of just errors.

Describe the solution you would like

Update vscode-json-languageservice to the latest version, 5.5.0 as of the time of writing

Describe alternatives you have considered

• Keep it as is and add the desired features in other ways
• vendor some/all of the package into vscode-yaml, which would allow

Additional context

It's not trivial, since it's a major version update, and we reference internal code, which has changed significantly