[core] Use our own published NPM packages

[confused-Techie]

Recently @savetheclocktower and I have begun the work to start publishing our packages directly to NPM.

So we should start taking advantage of it. This PR will migrate any dependencies that we publish to NPM instead of installing the packages from GitHub.

This PR will stay in draft until we've covered all the packages that we plan to publish in the short term.

[savetheclocktower]

Thanks for starting this PR! But don't forget we've got to change the imports themselves:

const LessCache = require('@pulsar-edit/less-cache');

[confused-Techie]

Thanks for starting this PR! But don't forget we've got to change the imports themselves:

const LessCache = require('@pulsar-edit/less-cache');

Ahh how could I forget, thanks!