Add option to select different JavaScript bundling

[eclectic-coding]

Describe the solution you'd like
Rails jsbundling-rails gem offered to use for bundling [bun|esbuild|rollup|webpack]. Each channge will require rethinking styling scaffolding

• bun
• esbuild (already offered)
• rollup
• Webpack (will not be offered)
• Add importmap option and set up bootstrap #32
  • Setup tailwind for importmap #34
  • Setup bulma for importmap
  • Setup postcss for importmap
  • Setup sass for importmap