Add static schema.json for Inngest config JSON Schema typing

[jpwilliams]

Summary

Adds a static schema.json in the root directory to be used to provide type hinting and validation to users while creating/editing Inngest config files.

{
  "$schema": "https://raw.githubusercontent.com/inngest/inngest/main/schema.json",
  // other usual props...
}

We could also refer to specific versions of the schema, though I think it makes sense to target main so we're looking at the very latest valid version.

{
  "$schema": "https://raw.githubusercontent.com/inngest/inngest/v0.5.5/schema.json",
  // other usual props...
}

I'd love to generate this directly from pkg/cuedefs/v1/function.cue, but our path to conversion doesn't yet support comments - see cue-lang/cue#1180. The comments are crucial to fulfil the purpose of teaching the user through tooling, hence the static version.

We could potentially introduce a very simple Dangerfile to prompt in PRs if function.cue is changed and schema.json is not to ensure they're kept in sync until cue-lang/cue#1180 is resolved.

Next

• encoding/*: allow exporting comments cue-lang/cue#1180
• Add to all inngest/scaffolds

[tonyhb]

This is pretty amazing! Definitely a huge fan of adding these kinds of type hints.