Draft: Typescript build tooling

[kmannislands]

This MR sets up for converting the project to typescript by modernizing the build tooling:

• Add typescript, in emit declaration mode
• Swap browserify and uglify-js for esbuild (faster, actively maintained, more popular, knows to build typescript)

It is probably best to create a feature branch to merge these small changes into

[kmannislands]

cc @neurolabusc @cdrake @hanayik I don't seem to have the github permissions to add reviewers

[kmannislands]

Next change, setup mocha to work with typescript: https://github.com/kmannislands/NIFTI-Reader-JS/pull/1/files

[hanayik]

Hi @kmannislands,

Thanks for starting this draft PR.

The NiiVue group discussed nifti-reader-js in our fortnightly meeting yesterday (12th April) and think it would be a good idea to devote some resources to getting the typescript related changes over the finish line.

@cdrake has offered to help out on this from the NiiVue team over the next 2-4 weeks.

During our discussions we highlighted a few things that would be good to outline in this PR comment chain.

1. update the tooling (already started by @kmannislands, and some esbuild changes merged in from @nellh via #28)
2. convert from JS to TS (@cdrake and @kmannislands can collaborate as needed)
3. enable automated build, test, and npm release GitHub Actions for PRs into the main/master branch (see NiiVue repo for examples

It would be great to discuss some of this at the next NiiVue meeting on 26 April 2023. @kmannislands, you are welcome to join if you want (5pm BST). Just let us know!

[neurolabusc]

@kmannislands the AFNI, FSL and MRIcro teams meet fortnightly to coordinate development on NiiVue. Everything we develop uses permissive licenses, so it can be used commercially. Feel free to email me if you would like to be invited and see if there are topics where we can join forces.

[hanayik]

This PR should be closed by #30