feat!: Add working conversion webhook with cert rotation

[sbernauer]

Description

Part of stackabletech/issues#642

An working example usage can be found in stackabletech/zookeeper-operator#958 update: https://github.com/stackabletech/zookeeper-operator/tree/feat/crd-versioning-2 (mainly look at rust/operator-binary/src/main.rs)

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

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the 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

[Techassi]

Partial review, I didn't look at the CertificateResolver yet.