Postinstall watch

[danielkcz]

This PR builds on top of #59, so I will keep it draft until that one is merged.

Currently recommended --once on postinstall is rather fragile (#51). This PR adds a watcher that will recreate generated files automatically when they disappear.

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[mattpocock]

@FredyC Could you add more detail as to why this is needed? I have tested locally and can't immediately see it working. Would love to hear more about your rationale

[danielkcz]

@mattpocock I am not sure what else you need to know. It is basically a proper solution for #51. Instead of having postinstall script with --once, when you have codegen running in watch mode and generated files are deleted, it will write them again.

[danielkcz]

@mattpocock Did new PR #68 as I messed up this one.

Also, I would add I am using this approach in the project for a couple of weeks and it's flawless. Besides remembering I need to have codegen running, I don't need to worry about yarn/npm reinstalls anymore.

[mattpocock]

OK, that's good to know. I tested it briefly locally but it wasn't working entirely as expected. I'll retest #68