Add MV_CONTAINS function (#133099)

* Add `mv_contains` function
* Add documentation for `mv_contains` function

---------

Co-authored-by: Liam Thompson <[email protected]>
Co-authored-by: Iván Cea Fontenla <[email protected]>

Author: 3 people

docs/changelog/133099.yaml

@@ -0,0 +1,5 @@
+pr: 133099
+summary: Add MV_CONTAINS function
+area: ES|QL
+type: enhancement
+issues: []

docs/reference/query-languages/esql/_snippets/functions/description/mv_contains.md

@@ -1,6 +1,7 @@
 * [`MV_APPEND`](../../functions-operators/mv-functions.md#esql-mv_append)
 * [`MV_AVG`](../../functions-operators/mv-functions.md#esql-mv_avg)
 * [`MV_CONCAT`](../../functions-operators/mv-functions.md#esql-mv_concat)
+* [preview] [`MV_CONTAINS`](../../functions-operators/mv-functions.md#esql-mv_contains)
 * [`MV_COUNT`](../../functions-operators/mv-functions.md#esql-mv_count)
 * [`MV_DEDUPE`](../../functions-operators/mv-functions.md#esql-mv_dedupe)
 * [`MV_FIRST`](../../functions-operators/mv-functions.md#esql-mv_first)

docs/reference/query-languages/esql/_snippets/functions/examples/mv_contains.md

@@ -21,6 +21,9 @@ mapped_pages:
 :::{include} ../_snippets/functions/layout/mv_concat.md
 :::
 
+:::{include} ../_snippets/functions/layout/mv_contains.md
+:::
+
 :::{include} ../_snippets/functions/layout/mv_count.md
 :::