Remove sideEffects field from -native's package.json

Having it may create confusion

Author: alcuadrado

packages/ethereum-cryptography-native/package.json

@@ -18,7 +18,6 @@
     "*.d.ts",
     "*.d.ts.map"
   ],
-  "sideEffects": false,
   "scripts": {
     "prepare": "npm run build",
     "build": "tsc --project tsconfig.prod.json",