Consider using ES modules and shipping non-transpiled build

Consider using / bunding ES Modules alongside other methods of distribution.

By doing so, users can utilize tools such as rollup, which perform tree-shaking and reduce code footprint.

Review Highland's current distribution and packaging entry points, then compare them with the ES module and non-transpiled outputs proposed in the issue. Done would mean documenting or implementing a distribution that lets users consume ES modules with tools such as Rollup for tree-shaking, with the resulting package outputs verified.

Written by the indexing model from the issue text.