[KQL] Add case-insensitive config for term/wildcard queries

[lukasolson]

Summary

Part of #55378.

Adds a caseInsensitive option to the KQL parsing options (KueryQueryOptions). When enabled, keyword queries (both wildcard^[1] and term^[2]) will add the case_insensitive option to enable case-insensitive search.

1. https://www.elastic.co/guide/en/elasticsearch/reference/8.6/query-dsl-wildcard-query.html#wildcard-query-field-params
2. https://www.elastic.co/guide/en/elasticsearch/reference/8.6/query-dsl-term-query.html#term-field-params

Checklist

• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[kertal]

It seems we need to also change codeownership to @elastic/kibana-data-discovery
The follow up would be to make use of this change in unified search based queries, right?

[davismcphee]

Code review, changes LGTM 👍 I agree with @kertal that we should also look at updating the CODEOWNERS file.

[lukasolson]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 80e3303

Metrics [docs]

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
kbnUiSharedDeps-srcJs	2.2MB	2.2MB	+272.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/es-query	249	250	+1

History

• 💚 Build #100847 succeeded 23d3c36
• 💚 Build #100264 succeeded 3d37d59
• 💚 Build #100246 succeeded 4731808

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @lukasolson