add pgbench test

test/pgbench/2677/new.sql

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+INSERT INTO "test"."complex_items"("arr_data", "field-with_sep", "id", "name")
+SELECT pgrst_body."arr_data", pgrst_body."field-with_sep", pgrst_body."id", pgrst_body."name"
+FROM (
+  SELECT '[{"id": 4, "name": "Vier"}, {"id": 5, "name": "Funf", "arr_data": null}, {"id": 6, "name": "Sechs", "arr_data": [1, 2, 3], "field-with_sep": 6}]'::json as json_data
+) pgrst_payload,
+LATERAL (
+  SELECT CASE WHEN json_typeof(pgrst_payload.json_data) = 'array' THEN pgrst_payload.json_data ELSE json_build_array(pgrst_payload.json_data) END AS val
+) pgrst_uniform_json,
+LATERAL (
+  SELECT * FROM json_to_recordset (pgrst_uniform_json.val) AS _ ("arr_data" integer[], "field-with_sep" integer, "id" bigint, "name" text)
+) pgrst_body
+RETURNING "test"."complex_items".*

test/pgbench/2677/old.sql

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+WITH
+pgrst_payload AS (SELECT '[{"id": 4, "name": "Vier"}, {"id": 5, "name": "Funf", "arr_data": null}, {"id": 6, "name": "Sechs", "arr_data": [1, 2, 3], "field-with_sep": 6}]'::json AS json_data),
+pgrst_body AS ( SELECT CASE WHEN json_typeof(json_data) = 'array' THEN json_data ELSE json_build_array(json_data) END AS val FROM pgrst_payload)
+INSERT INTO "test"."complex_items"("arr_data", "field-with_sep", "id", "name")
+SELECT "arr_data", "field-with_sep", "id", "name"
+FROM json_to_recordset ((SELECT val FROM pgrst_body)) AS _ ("arr_data" integer[], "field-with_sep" integer, "id" bigint, "name" text)
+RETURNING "test"."complex_items".*

test/pgbench/README.md

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+## pgbench tests
+
+Can be used as:
+
+```
+postgrest-with-postgresql-15 -f test/pgbench/fixtures.sql pgbench -n -T 10 -f test/pgbench/2677/old.sql
+postgrest-with-postgresql-15 -f test/pgbench/fixtures.sql pgbench -n -T 10 -f test/pgbench/2677/new.sql
+```

test/pgbench/fixtures.sql

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+\ir ../spec/fixtures/load.sql
+
+ALTER TABLE test.complex_items
+    DROP CONSTRAINT complex_items_pkey;
+
+ALTER TABLE test.complex_items
+    ALTER COLUMN "field-with_sep" DROP NOT NULL;