Kick @code-dot-org/johnny-five out of the code-studio-common bundle

[balderdash]

We use johnny-five in the maker toolkit, so it should live in the applab.js bundle. Instead, it's taking up a bunch of space in code-studio-common:

It got there because the shared toolbox settings cog checks if maker toolkit is enabled, and in doing so requires all the maker toolkit code. This PR moves the maker.isEnabled/maker.isAvailable methods to the maker toolkit redux module (which is where that enabled/available information comes from anyway) to break that dependency and move johnny-five back to the applab.js bundle.

[balderdash]

Cut down common JS bundle size

[islemaster]

Awesome, nice catch.

Are we doing anything to ensure johnny-five stays in the applab.js bundle? Or do we just need to check on this manually every once in a while?

[balderdash]

I've started logging bundle sizes, and I'm hoping to hook up some kind of test/PR status/monitoring to that so we can notice if a bundle gets unexpectedly larger. I'm not sure if it would be worth adding automated checks for specific modules that should/shouldn't be in specific bundles, at least not until we notice something causing problems repeatedly.