CHORE: use a parser instead of splitting command strings by space

[RamIdeas]

In the absence of a shell command parser, we split strings by space (cmd.split(" ")) in a few places (mainly, in create-cloudflare but also in wrangler too).

We primarily do this for the DX of writing command strings vs manually writing an array of arguments. The intention is to fallback to writing an array when one of the arguments includes a space itself but the developer has to know/remember this – it is easy to miss/forget and has bitten us in the past.

Instead, we should replace these with shell-quote/parse https://www.npmjs.com/package/shell-quote