ES|QL Support for ST_GEOHASH, ST_GEOTILE and ST_GEOHEX (elastic#125143)

Added support for the three primary scalar grid functions:
* `ST_GEOHASH(geom, precision)`
* `ST_GEOTILE(geom, precision)`
* `ST_GEOHEX(geom, precision)`

As well as versions of these three that take an optional `geo_shape` boundary (must be a `BBOX` ie. `Rectangle`).

And also supporting conversion functions that convert the grid-id from long to string and back to long.

This work represents the core of the feature to support geo-grid aggregations in ES|QL.

Author: craigtaverner

docs/changelog/125143.yaml

@@ -0,0 +1,6 @@
+pr: 125143
+summary: "ES|QL Support for ST_GEOHASH, ST_GEOTILE and ST_GEOHEX"
+area: "ES|QL"
+type: enhancement
+issues:
+ - 123903

docs/reference/query-languages/esql/_snippets/functions/layout/round_to.md

@@ -33,6 +33,8 @@ dependencies {
   implementation project('compute:ann')
   implementation project(':libs:dissect')
   implementation project(':libs:grok')
+  api "org.apache.lucene:lucene-spatial3d:${versions.lucene}"
+  api project(":libs:h3")
   implementation project('arrow')
 
   // Also contains a dummy processor to allow compilation with unused annotations.
@@ -62,6 +64,10 @@ dependencies {
   internalClusterTestImplementation project(":modules:mapper-extras")
 }
 
+tasks.named("dependencyLicenses").configure {
+  mapping from: /lucene-.*/, to: 'lucene'
+}
+
 def generatedPath = "src/main/generated"
 def projectDirectory = project.layout.projectDirectory
 def generatedSourceDir = projectDirectory.dir(generatedPath)