Move provision script to CLI

[ccrvlh]

Describe the solution you'd like:
As of now, the provision.sh does most of the heavy lifting to setup Flintlock and dependencies (Firecracker, containerd, networking etc) to a host machine. The idea is to port this script to a CLI.

Why do you want this feature:
Even though the script works great, having this feature in a CLI would make for a better developer experience, and probably easier to maintain and extend.

I believe there's still the discussion of whether this should be part of the flintlock CLI or maybe of a client (similar to what was discussed here), I ended up creating a repo to start working on this, very early stages still. We can later decide where we want that to live. If anyone else also wants to work on this, we could easily just move that to a branch inside fl or flintlock though.

About the code itself, there's also the decision to use exec.Command vs adding more dependencies (for example, DIgitalOcean maintains a SDK to interact with libvirtd), just something to consider.

[Callisto13]

another note on the cli for this: in the past we have used spf13/cobra, but we are making a conscious effort to replace that and use urfave/cli instead

[ccrvlh]

Noted, I saw that discussion in the past (I think it was driven by containerd's use of urfave/cli?) and started the project with urfave as well.

PS: Noticed the repo link was private, just changed that to public.

[Callisto13]

(I think it was driven by containerd's use of urfave/cli?)

10% that, 90% i just don't like cobra 😂

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