Quick changes to support array item validation

[tbrockman]

Not sure whether this contribution will be appreciated (and I totally won't be offended if it isn't), but I wanted syntax highlighting on individual (non-object) array items to work (plus to change some linting behavior to mirror VSCode a bit more closer, for ex. missing required properties highlighting the key) and I'd already done a bit of poking around the code to patch away the use of shikijs (my specific use-case makes it a bit less straight-forward to use things which require WASM), and had plans to make changes to autocomplete... so I just figured what the heck, may as well make a fork.

Rather than hoard my changes I thought I'd share them in case they're at all useful to the project. Admittedly, I haven't thoroughly tested them (beyond passing tests), so I'm open to making some edits if it turns out to have been an incorrect approach, but so far it seems to work for my needs.

This PR extends the existing getJsonPointers() code to add support for registering pointers to non-object array items, returning most specific error paths (when possible), and updates existing tests to reflect the changes. It also updates keyFrom and keyTo to be optional, to allow root objects and array elements to not have a key range (which makes sense to me), only a value range.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 69e36c638f670d0618be384204e6fc8e13b1a941

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
codemirror-json-schema	Patch

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[acao]

awesome work, @tbrockman ! I plan to look at this more closely soon, I'm interested in seeing if we need to add any more test cases if you add a changeset, we can add this to the next release!

[tbrockman]

@acao sounds great, will do when I find some time!

[acao]

sorry @tbrockman just getting to this now! I will have to be careful about reconciling the changes to pointers

[eggplants]

workaround: https://github.com/tkytel/mantela-editor/blob/c6839ee0aa48e81aaf688ff4056b43040d72049b/src/helpers/JsonSchemaLinter.ts