Add support for order by in aggregate functions for sqlite3

https://sqlite.org/lang_aggfunc.html
group_concat and string_agg support order by clause inside them

Author: yopoyka

internal/endtoend/testdata/group_concat/sqlite/go/db.go

@@ -0,0 +1,11 @@
+-- name: GroupConcatOne :one
+SELECT group_concat(name order by id asc) FROM book;
+
+-- name: GroupConcat :one
+SELECT group_concat(name order by id asc) FROM book;
+
+-- name: GroupConcatDelimeter :one
+SELECT group_concat(name, ',' order by id asc) FROM book;
+
+-- name: StringAgg :one
+SELECT string_agg(name, ',' order by id asc) FROM book;

internal/endtoend/testdata/group_concat/sqlite/go/models.go

@@ -0,0 +1,4 @@
+CREATE TABLE book(
+    id integer primary key,
+    name text not null
+);

internal/endtoend/testdata/group_concat/sqlite/go/query.sql.go

@@ -0,0 +1,9 @@
+version: '2'
+sql:
+- schema: schema.sql
+  queries: query.sql
+  engine: sqlite
+  gen:
+    go:
+      package: querytest
+      out: go

internal/endtoend/testdata/group_concat/sqlite/query.sql

@@ -307,7 +307,7 @@ expr:
     ) #expr_in_select
     | expr AND_ expr #expr_bool
     | expr OR_ expr #expr_bool
-    | qualified_function_name OPEN_PAR ((DISTINCT_? expr ( COMMA expr)*) | STAR)? CLOSE_PAR filter_clause? over_clause? #expr_function
+    | qualified_function_name OPEN_PAR ((DISTINCT_? expr ( COMMA expr)*) order_by_stmt? | STAR)? CLOSE_PAR filter_clause? over_clause? #expr_function
     | OPEN_PAR expr (COMMA expr)* CLOSE_PAR #expr_list
     | CAST_ OPEN_PAR expr AS_ type_name CLOSE_PAR #expr_cast
     | expr COLLATE_ collation_name #expr_collate