Include built js files within package

[Hazelfire]

It would be great if a distribution of rationale could include the built js files within it.

The reason this would be useful is for publishing JS packages that depend on rescript code, if the built js files are included within the package, then the JS code can reference the built files within rationale, rather than needed to run rescript build -with-deps to create those dependencies (which can't be asked for when publishing a package).

The other alternative is include rationale inside the distribution of my package. However, I don't think that's ideal, as it leads to duplication. The rescript package itself follows the pattern of including js build files within its npm package.

For reference, a post on the forum about this issue: https://forum.rescript-lang.org/t/how-to-publish-a-rescript-project-for-javascript-users/656/9
And the original issue as it relates to my project: quantified-uncertainty/squiggle#42