Provision Kerberos principals for IP addresses

[nightkr]

Description

Previously, Kerberos principals were only provisioned for hostnames. This PR also adds support for IP addresses, since we default to using IP addresses for NodePort listeners (vs the old node scope, which used hostnames).

Fixes stackabletech/kafka-operator#812.

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

# Author
- [x] Helm chart can be installed and deployed operator works
- [x] Integration tests passed (for non trivial changes)

# Reviewer
- [ ] Code contains useful comments
- [ ] Code contains useful logging statements
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated. Follows the [style guide](https://docs.stackable.tech/home/nightly/contributor/docs/style-guide).
- [ ] Changelog updated
- [ ] Cargo.toml only contains references to git tags (not specific commits or branches)

# Acceptance
- [ ] Feature Tracker has been updated
- [ ] Proper release label has been added
- [ ] [Roadmap](https://github.com/orgs/stackabletech/projects/25/views/1) has been updated

[sbernauer]

Code and test looks good, thanks!
Can you please add a changelog entry?

[nightkr]

@sbernauer Like 58b5272, you mean? :P

[sbernauer]

You were quicker ;)