Feature KeyValue field is back

We had a request last week about the KeyValue field. It didn't make it in the initial Hotwire release.
But now it's back. Use it on your favourite JSON columns.

We also added YAML lang support to the code field and fixed a bug that was showing up in testing env. Some Webpacker methods were required, so that's removed now.

Let us know what you think 🤙

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