Add function websearch_to_tsquery

Seems to be commonly used for searches - returns ts_query type that is a text type
Tested locally with

`
SELECT *
FROM Recipes WHERE search @@ websearch_to_tsquery('english', ?);
`

dialects/postgresql/src/main/kotlin/app/cash/sqldelight/dialects/postgresql/PostgreSqlTypeResolver.kt

@@ -182,6 +182,7 @@ class PostgreSqlTypeResolver(private val parentResolver: TypeResolver) : TypeRes
     "to_tsquery" -> IntermediateType(TEXT)
     "to_tsvector" -> IntermediateType(PostgreSqlType.TSVECTOR)
     "ts_rank" -> encapsulatingType(exprList, REAL, TEXT)
+    "websearch_to_tsquery" -> IntermediateType(TEXT)
     else -> null
   }