make pg_session_jwt instalation optional with a cli flag

proxy/subzero/sql/include/tenant1.sql

@@ -0,0 +1,18 @@
+CREATE SCHEMA IF NOT EXISTS tenant1;
+
+CREATE TABLE IF NOT EXISTS tenant1.items (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(255) NOT NULL
+);
+
+INSERT INTO tenant1.items (name) VALUES 
+    ('tenant1 item 1'),
+    ('tenant1 item 2'),
+    ('tenant1 item 3');
+
+
+CREATE ROLE tenant1_role NOINHERIT;
+GRANT ROLE tenant1_role TO authenticator;
+
+GRANT USAGE ON SCHEMA tenant1 TO tenant1_role;
+GRANT ALL ON ALL TABLES IN SCHEMA tenant1 TO tenant1_role;