[dartboard] Rewrite helm client to use helm v3 go-sdk

[git-ival]

Use the helm v3 package: https://pkg.go.dev/helm.sh/helm/v3

• Implement functions for commonly used helm cli commands with their respective options/flags

  • helm install
  • helm upgrade
  • helm get values
  • helm uninstall
  • helm repo add (no options/flags required for MVP)
  • helm repo update (no options/flags required for MVP)

• Move Rewrite helm client shepherd#152 to dartboard