test: Reorganize test/ folder into one subdirectory for each test type

test/load/fixtures.sql

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+CREATE ROLE postgrest_test_anonymous;
+GRANT postgrest_test_anonymous TO :USER;
+CREATE SCHEMA test;
+
+-- PUT+PATCH target needs one record and column to modify
+CREATE TABLE test.actors (
+  PRIMARY KEY (actor),
+  actor         INT,
+  name          TEXT,
+  last_modified TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
+);
+INSERT INTO test.actors VALUES (1, 'John Doe');
+
+-- POST target needs generated PK
+CREATE TABLE test.films (
+  PRIMARY KEY (film),
+  film  INT GENERATED BY DEFAULT AS IDENTITY,
+  title TEXT
+);
+
+-- DELETE target remains empty
+CREATE TABLE test.roles (
+  actor     INT REFERENCES test.actors,
+  film      INT REFERENCES test.films,
+  character TEXT
+);
+
+CREATE FUNCTION test.call_me (name TEXT) RETURNS TEXT
+STABLE LANGUAGE SQL AS $$
+  SELECT 'Hello ' || name || ', how are you?';
+$$;
+
+GRANT USAGE ON SCHEMA test TO postgrest_test_anonymous;
+GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA test TO postgrest_test_anonymous;