Allow command flags to be configured from autorc

[hipstersmoothie]

Is your feature request related to a problem? Please describe.

I want to permanently enable some flag for an auto command

Describe the solution you'd like

.autorc

{
  // Configure any of auto's commands
  "release": {
    // Prerelease will always be true unless the --prerelease flag is provided
    "prerelease": true
  }
}

Additional context

This will also solve for forcing canaries in #993. With this new type of configuration a user could provide the following to always have canaries, whether or not they're made through the canary or shipit command.

{
  "canary": {
    "force": true
  }
}

[adierkens]

🚀 Issue was released in v9.15.0 🚀