DATE_RANGE data type for esql

[shmuelhanoch]

Basic support for DATE_RANGE field type.

[nik9000]

I'd add another test to x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/10_basic.yml that loads the range and asserts that output looks right. That should work given when you are, but it's really simple to point at.

After than, I'd try and get the rest of the tests passing.

[github-actions]

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[nik9000]

Makes sense to me. I think it's time to drop draft from this, get all the tests happy, and get it in. Then we can extend it with stuff like supporting this field type in top n (not as a sort key, but as a sorted field), COALESCE, TO_STRING, etc. And maybe a TO_DATE_RANGE function too. Lots of separate stuff we can build on top of this.