devlow: use commander for cli argument parsing (#93860)
This has devlow use `commander` to parse its arguments.
There's a breaking change here to make it fit better into `commander`'s
patterns without extra code. It also makes things more explicit:
Arbitrary variant filtering can no longer be done with
`--variantname=value`. Now that there are more flags, these share the
namespace with these, so instead we use `--filter variantname=value`, or
`-F variantname=value`.
Co-authored-by: vercel-fleet-prod[bot] <318278635+vercel-fleet-prod[bot]@users.noreply.github.com>
Co-authored-by: Will Binns-Smith <755844+wbinnssmith@users.noreply.github.com>
