fix(package.json): flag most of bootstrap-vue as being side effect free (#2268)

Author: tmorehouse

package.json

@@ -49,6 +49,12 @@
     "nuxt",
     "es"
   ],
+  "sideEffects": [
+    "./es/utils/object.js",
+    "./src/utils/object.js",
+    "./es/utils/array.js",
+    "./src/utils/array.js"
+  ],
   "scripts": {
     "build": "scripts/build",
     "watch": "rollup -c scripts/rollup.config.js --watch",