Add babel-plugin-annotate-pure-calls

[Beraliv]

⭐️ S (situation) ⭐️

UglifyJS cannot clearly understand if the module is side effect free

⭐️ T (task) ⭐️

babel-plugin-annotate-pure-calls helps with automatic #PURE annotation insertion. It add the comment to top level call expressions and new expressions in assignment contexts (those are considered by the plugin as side effect free). This helps UglifyJS to perform dead code elimination more efficiently and therefore reduces the bundle sizes for the consumers

Link: https://www.npmjs.com/package/babel-plugin-annotate-pure-calls

⭐️ A (action) ⭐️

Add babel-plugin-annotate-pure-calls

⚠️ However, it can break current usage ⚠️

⭐️ R (result) ⭐️

It can lead to even more size reduction