Could CRDAppFactory be made an interface?

[jorgemoralespou]

Describe the problem/challenge you have
When reusing/embedding kctrl dev mode into our own CLI, we want to be able to control output of the 3 different phases, fetch/template/deploy, and as such, we want to be able to provide 3 different CmdRunners to each phase.
Currently, as CRDAppFactory is a struct without an interface, we can't override behavior to provide our own here: https://github.com/carvel-dev/kapp-controller/blob/develop/pkg/app/app_factory.go#L25

Describe the solution you'd like
It'll be ideal that there be an interface so that we could replace the call in kctrl local with an alternate version that provides different runners with different loggers.

Anything else you would like to add:
Alternatively, it'll be ideal to have detailed logging happening on each phase, so that logging can be properly customised for each phase.

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[sethiyash]

Hello @jorgemoralespou,

Appreciate your diligence in highlighting this. Indeed, making CRDAppFactory an interface sounds like a favourable approach. Please don't hesitate to submit a pull request (PR) at your convenience. I want to assure you that we will prioritise the review promptly. Alternatively, We will prioritise and address this.