Better editor support

[johnlindquist]

Progress

• Priority - HIGH
• Probably 2 weeks away

Explanation

The current editing experience leaves a lot to be desired since there's zero code-hinting or import help

How

1. code-hinting for imports

current recommended workaround for a much better experience:

await npm("rxjs")
let {Observable} = await import("rxjs")

I think we can get rid of the npm helper completely by leveraging how we scan the //Menu: Foo metadata to also scan for import("foo") and prompt to install. I still need to experiment with the experience of it.

2. code-hinting for .kit

The plan is to add a .kit/src containing TypeScript files that export to the current structure. This will be a huge win for everyone, especially people who want to contribute/refactor since we can just operate in the src dir and treat the .kit root as a "dist". This might be challenging to configure since the preload scripts need to be commonjs whereas the cli/etc scipts are modules, but I'm confident it can be done.