manipulate the cluster creation options after provisioning the cluster

[MohamedMSaeed]

Give the engineer the ability to manipulate the cluster creation options after provisioning the cluster

Use case: an engineer provisioned a cluster without --enable-flagger option. Now he needs to install flagger. So instead of letting him do it manually, the script will copy the needed files to his cluster dir.

Options:

1. --enable-flagger => to enable flagger
2. --add-capi-templates => to add capi templates to the clsuter.