feat: esm

Closes #2981 I kept this PR as minimal as I could. It introduces esbuild to be able to compile ESM to CJS to support both: - I had to migrate `lib` to ESM because esbuild doesn't support transforming `require()` into `import` - I had to write a little esbuild plugin to transform TLAs into `require()` Things left to do where I'll need some help: - I added a build script for esm/cjs but I'm not sure how it relates to `install/build.js` - I'm not sure how tests are currently setup so unsure how to properly test esm/cjs - I left some `require()` calls in `libvips.js` because they only seem consumed by `binding.gyp`