chore: add sideEffects false to package.json (#5025)

* chore: add sideEffects false to package.json

This flag within the package.json file allows marking that a package does not make use of side effects, as documented here: https://webpack.js.org/guides/tree-shaking/#mark-the-file-as-side-effect-free

* Fixed a typo and removed EOL

There was no EOL in the original, so removing it to minimise diff

* Update package.json

Co-authored-by: Jay <jasonsaayman@gmail.com>

package.json

@@ -132,5 +132,6 @@
     "Yasu Flores (https://github.com/yasuf)",
     "Ben Carp (https://github.com/carpben)",
     "Daniel Lopretto (https://github.com/timemachine3030)"
-  ]
+  ],
+  "sideEffects": false
 }