Document EF.Functions.JsonPathExists (#449)

See npgsql/efcore.pg#3733

Author: roji

conceptual/EFCore.PG/mapping/translations.md

@@ -118,6 +118,7 @@ collection.Contains(item)                | item IN collection
 enumValue.HasFlag(flag)                  | enumValue & flag = flag
 Guid.CreateVersion7()                    | [uuidv7()](https://www.postgresql.org/docs/current/functions-uuid.html) (added in 10 when targeting PG18, client-evaluated otherwise)
 Guid.NewGuid()                           | [gen_random_uuid()](https://www.postgresql.org/docs/current/functions-uuid.html), or [uuid_generate_v4()](https://www.postgresql.org/docs/current/uuid-ossp.html) from [`uuid-ossp`](https://www.postgresql.org/docs/current/uuid-ossp.html) when targeting pre-PG13
+EF.Functions.JsonPathExists(json, path)  | [JSON_EXISTS(json, path)](https://www.postgresql.org/docs/current/functions-json.html#FUNCTIONS-SQLJSON-CHECK) (added in 11)
 nullable.GetValueOrDefault()             | coalesce(nullable, 0)
 nullable.GetValueOrDefault(defaultValue) | coalesce(nullable, defaultValue)
 

conceptual/EFCore.PG/release-notes/11.0.md

@@ -89,4 +89,5 @@ For more details, see the [temporal constraints documentation](../misc/temporal-
 
 ## Other new features
 
+* Added support for the new EF Core `EF.Functions.JsonPathExists()` function, which translates to [SQL/JSON `JSON_EXISTS`](https://www.postgresql.org/docs/current/functions-json.html#FUNCTIONS-SQLJSON-CHECK). This works on scalar string columns as well as on complex and owned JSON properties.
 * Added `EF.Functions.IntersectsBbox(geom1, geom2)` for expressing [the PostGIS `&&` operator](https://postgis.net/docs/geometry_overlaps.html). Thanks to [@bjornharrtell](https://github.com/bjornharrtell) for this contribution!