emit the gzip size in bytes after building lib

Author: mayank1513

lib/package.json

@@ -16,7 +16,7 @@
     "dist/**"
   ],
   "scripts": {
-    "build": "tsup && tsc -p tsconfig-build.json",
+    "build": "tsup && tsc -p tsconfig-build.json && gzip -c dist/index.js | wc -c",
     "clean": "rm -rf dist",
     "dev": "tsup --watch && tsc -p tsconfig-build.json -w",
     "typecheck": "tsc --noEmit",