Revert CJS support - not actually needed.

Author: rkistner

.gitignore

@@ -1,7 +1,6 @@
 node_modules
 lib
 dist
-cjs
 *.tsbuildinfo
 .vscode
 .DS_STORE

packages/common/package.json

@@ -7,13 +7,12 @@
   },
   "description": "API definitions for JourneyApps PowerSync",
   "type": "module",
-  "main": "dist/bundle.cjs",
+  "main": "dist/bundle.mjs",
   "module": "dist/bundle.mjs",
   "types": "lib/index.d.ts",
   "exports": {
     ".": {
       "import": "./dist/bundle.mjs",
-      "require": "./dist/bundle.cjs",
       "default": "./dist/bundle.mjs",
       "types": "./lib/index.d.ts"
     }
@@ -33,7 +32,7 @@
   },
   "homepage": "https://docs.powersync.com",
   "scripts": {
-    "build": "tsc -b && rollup -c rollup.config.mjs && rollup -c rollup-cjs.config.mjs",
+    "build": "tsc -b && rollup -c rollup.config.mjs",
     "clean": "rm -rf lib dist tsconfig.tsbuildinfo",
     "test": "vitest"
   },