Replace `gulp` with `rollup`

[david-poindexter]

Is your feature request related to a problem?

Many gulp dependencies have security vulnerabilities that can be difficult, and in many cases impossible, to address.

Describe the solution you'd like

Replace gulp with rollup.

Describe alternatives you've considered

Several alternatives have been considered, but rollup is highly performant and requires way fewer dependencies with way fewer security concerns (mostly due to limited to no downline dependencies).

Additional context

This will also significantly reduce the complexity of usage. It will require documentation updates.