cli: node groups

[malt3]

Context

This is the second part of nodeGroup enablement. While previously, we modified the terraform templates to support nodeGroups, this PR exposes nodeGroups to the user via the constellation-conf.yaml.

As a side-effect, we deprecate the "--control-plane-nodes" and "--worker-nodes" flags from "constellation create".

Proposed change(s)

• add nodeGroups to config
• update config version to v4
• deprecate old flags
• remove deprecated flags from docs

Future changes (for other PRs)

• add section in the docs to guide users on how to use node groups
• config migration (v3 -> v4)

Checklist

• Update docs
• Add labels (e.g., for changelog category)
• Is PR title adequate for changelog?
• Link to Milestone
• e2e test

[elchead]

Some doc comments:

• how to migrate the config to NodeGroups.
• describe what values can be set for each field of the NodeGroup, specifically Zone (link to CSP), InstanceType and StateDiskType.
• explicitly state that you can configure multiple node groups of the same role to allow different node setups
• state that at least a control_plane_default and worker_default nodeGroup are required (no renaming) since we validate the config, it seems easier to maintain only the code

[elchead]

like the config validation :)
For the regions / zones @thomasten said that we don't want to hardcode specific values in the validation, so that we can support new types without having to release a CLI. Is this different here?

[derpsteb]

Can't remove myself from PR :(
Didn't look in depth.