Add Husky for pre-commit formatting hooks

[queengooborg]

This PR adds husky as a dependency for pre-commit hooks to format all of the files before creating a commit.

[nschonni]

Might be worth looking at combining this with https://www.npmjs.com/package/lint-staged so that descrete actions can be hooked depending on the file type. EX: https://github.com/w3c/aria-practices/blob/6aaf4d48fc690a9d5ddbfbec32cfc7f15a16dd40/package.json#L63-L74

[queengooborg]

That's the eventual plan!

Edit: actually, we might as well add lint-staged now 'cause why not? 😛

[nschonni]

You can also do some cool triggers on individual files if you need to run regeneration when a schema changes

[nschonni]

Think this is a little friendly for cross platform. I think only Windows does the .bin or maybe I have that reversed

Suggested change

	node node_modules/.bin/lint-staged
	npx lint-staged

[Elchi3]

Let's ask in the next owner's meeting about pre-commit hooks. I'm not against it per se, just want to make sure the majority appreciates these ergonomics. Also, might be nice to mention this in the contribution docs if we introduce them.

[queengooborg]

MDN content just landed this, so let's land this here as well!