Migrate ignite packager

[joshuayoes]

Note that Gluegun is community-supported and the core team will not be adding new features other than those submitted as PRs by the community.

Is your feature request related to a problem? Please describe.
Packager has a pretty limited API, Ignite has a more robust API built in that would have a better home in gluegun.

Describe the solution you'd like
An MR has been started in ignite with a new mental model for working with packager commands that would be good for porting the existing logic in ignite over to gluegun

Describe alternatives you've considered

• We could just copy and paste the existing logic. Not a bad idea, but porting to a mental model where commands are an array of strings would be a more resilient mental model

Additional context
Prompted by this issue in Ignite where an error occured because an unexpected warning was prepended to a json payload.