Add install command to Botkube CLI

[mszostok]

Overview

A user needs to know whether the Botkube installation process is successful or not, and be informed of any errors. The current helm install process will time out if there are problems and the user needs to look at the pod logs to troubleshoot the issue. There are some common pitfalls with Botkube configuration that cause the installation to fail (e.g. bot not invited to channel, wrong channel name, etc.) and resolving those issues is cumbersome.

Acceptance Criteria

• Add install command
  - use Helm Go SDK underneath to install the chart
  - Use Kubernetes API and stream Pod logs
  - print them to user only errors/warnings/info
  - ensure pretty print (logs are properly colored)
  - make sure it can be run with debug/verbose
  - support dry-run
  - support Botkube version and overrides
  - Respect KUBECONFIG env variable
• Document this command on docs.botkube.io

New scope added

• Add uninstall command: Add botkube uninstall command #1141