move postgres to a separate package

packages/postgres/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "@bknd/postgres",
+  "version": "0.0.1",
+  "type": "module",
+  "main": "dist/index.js",
+  "module": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "build": "tsup",
+    "test": "bun test",
+    "docker:start": "docker run --rm --name bknd-test-postgres -d -e POSTGRES_PASSWORD=postgres -e POSTGRES_USER=postgres -e POSTGRES_DB=bknd -p 5430:5432 postgres:17",
+    "docker:stop": "docker stop bknd-test-postgres"
+  },
+  "dependencies": {
+    "pg": "^8.12.0",
+    "kysely": "^0.27.6"
+  },
+  "devDependencies": {
+    "@types/bun": "^1.2.5",
+    "@types/node": "^22.13.10",
+    "@types/pg": "^8.11.11",
+    "bknd": "workspace:*",
+    "tsup": "^8.4.0",
+    "typescript": "^5.6.3"
+  },
+  "tsup": {
+    "entry": ["src/index.ts"],
+    "format": ["esm"],
+    "target": "es2022",
+    "clean": true,
+    "minify": true,
+    "dts": true,
+    "metafile": true,
+    "external": ["bknd", "pg", "kysely"]
+  },
+  "files": ["dist", "!*.map", "!metafile*.json"]
+}