move postgres to a separate package

packages/postgres/test/setup.ts

@@ -0,0 +1,25 @@
+import type { Kysely } from "kysely";
+import { PostgresConnection, PostgresIntrospector, type PostgresConnectionConfig } from "../src";
+
+export const info = {
+   host: "localhost",
+   port: 5430,
+   user: "postgres",
+   password: "postgres",
+   database: "bknd",
+};
+
+export function createConnection(config: PostgresConnectionConfig = {}) {
+   return new PostgresConnection({
+      ...info,
+      ...config,
+   });
+}
+
+export async function cleanDatabase(connection: PostgresConnection) {
+   const kysely = connection.kysely;
+
+   // drop all tables & create new schema
+   await kysely.schema.dropSchema("public").ifExists().cascade().execute();
+   await kysely.schema.createSchema("public").execute();
+}