tests: added invalid_func_args pgx test

Author: victoraugustolls

internal/endtoend/testdata/invalid_func_args/query.sql renamed to internal/endtoend/testdata/invalid_func_args/pgx/query.sql

@@ -0,0 +1,13 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "path": "go",
+      "engine": "postgresql",
+      "driver": "pgx/v4",
+      "name": "querytest",
+      "schema": "query.sql",
+      "queries": "query.sql"
+    }
+  ]
+}

internal/endtoend/testdata/invalid_func_args/pgx/sqlc.json

@@ -0,0 +1,2 @@
+SELECT random(1);
+SELECT position();

internal/endtoend/testdata/invalid_func_args/stderr.txt renamed to internal/endtoend/testdata/invalid_func_args/pgx/stderr.txt

@@ -0,0 +1,3 @@
+# package querytest
+query.sql:1:8: function random(unknown) does not exist
+query.sql:2:8: function position() does not exist