Add dedicated mv_overlap, mv_contains functions. (#18084)

* Add dedicated mv_overlap, mv_contains functions.

Introduces new multi-value string functions at the native layer. These
are now used for the SQL `MV_OVERLAP` and `MV_CONTAINS` functions. The main
purpose of the new functions is to have slightly different null and empty-array
handling behavior vs `array_overlap` and `array_contains`. Behavior is designed
to align with the native `inType` filter, which is especially important for
`MV_OVERLAP`, because the SQL layer can convert `MV_OVERLAP` into an `inType`
filter.

The SQL layer no longer generates calls to the `mv_harmonize_nulls` function,
because that logic has been moved inside `mv_overlap` and `mv_contains`. The
function still remains at the native layer for backwards compatibility.

* Remove unused variables.

* Update quidem-ut tests.

* Additional tests in FunctionTest.

* Remove unneeded code.

* Ensure we don't use the array element filter for MV_CONTAINS.

* Fix array constructor type detection.

* Cast second arg to string array.

* Remove unnecessary overrides of DirectOperatorConversion stuff.

* Code cleanup

Author: gianm

extensions-core/druid-bloom-filter/src/main/java/org/apache/druid/query/filter/sql/BloomFilterOperatorConversion.java

@@ -23,7 +23,6 @@
 import org.apache.calcite.rex.RexLiteral;
 import org.apache.calcite.rex.RexNode;
 import org.apache.calcite.sql.SqlFunction;
-import org.apache.calcite.sql.SqlOperator;
 import org.apache.calcite.sql.type.ReturnTypes;
 import org.apache.calcite.sql.type.SqlTypeFamily;
 import org.apache.druid.guice.BloomFilterSerializersModule;
@@ -58,12 +57,6 @@ public BloomFilterOperatorConversion()
     super(SQL_FUNCTION, BloomFilterExpressions.TestExprMacro.FN_NAME);
   }
 
-  @Override
-  public SqlOperator calciteOperator()
-  {
-    return SQL_FUNCTION;
-  }
-
   @Nullable
   @Override
   public DimFilter toDruidFilter(