Upgrade helm and clean up generated code/files under config

[unmarshall]

How to categorize this issue?

/area quality
/kind cleanup

What would you like to be added:

• Upgrade helm to 3.16.2
• Start using intrinsic support for crds in Helm3. One needs to create a crds directory under charts/druid/ and generate all crds directly into this directory.
• Remove config directory
• Move out config/samples to top level examples directory

Why is this needed:
We only wish to support deploying etcd-druid via helm charts. We have generated code under config directory to enable usage of kustomise but we not neither used it nor actively maintained it. It therefore makes sense to completely remove it and simplify the code base.