kctrl: Install kapp-controller from kctrl

[ThomasVitale]

Describe the problem/challenge you have
This feature request, similar to #1001, aims at streamlining the onboarding experience when using Carvel packages.

Right now, the steps needed to setup an environment are the following:

1. Install kapp-controller with kubectl or kapp (+ optional wait for readiness when using kubectl).
2. Add a package repository with kctrl (+ create namespace).
3. Install a package with kctrl.

Step 1 could be made more straightforward, without the need to reference the URL where the YAML manifests are published (found via lookup + copy/paste). Using kubectl to install kapp-controller leads to an additional step to check when the controller is actually deployed and ready (required before moving to step 2). Using kapp would solve that problem since it waits for it to be ready, but it means installing an additional tool.

In the context of onboarding people to Carvel, or when using Carvel to setup a demo/tutorial/workshop/training, the current experience could be improved and simplified (less cognitive load and less tools).

Describe the solution you'd like

I suggest extending the capabilities of the kctrl CLI so that it can be used to install kapp-controller. For example:

kctrl cluster init

The main goal is to improve the onboarding experience and for that no further arguments should be needed. But this could be further enhanced to provide additional capabilities for research or production-oriented scenarios. For example, the CLI could accept additional arguments to customise/configure the deployment. One example of that would be which version of kapp-controller to install.

kctrl cluster init --version 0.44.1

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