Rollup is including lodash code inside the ESM build

[DavidEspinola]

Since rollup.config.esm.js is configuring "external" as the full lodash library but imports are including specific modules, this config is not taking effect and Rollup is including a large ammount of lodash code in the ESM bundle.

Fixing this configuration reduces bundle size to less than a half, so I think is something good to include. I'll be happy to include this optimization in my projects.