feat: Add StatefulSet rollout tracker

[nightkr]

Description

Extracted from stackabletech/hdfs-operator#571, as requested by stackabletech/hdfs-operator#571 (comment).

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] Changes are OpenShift compatible

# Reviewer
- [ ] Code contains useful comments
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated
- [ ] 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

[sbernauer]

Thanks! FYI: I updated the PR title, hope that's ok

[nightkr]

Conventional commits are gonna be the death of us all.