feat: Support serviceOverrides on the ListenerClass

[sbernauer]

Description

Part of #324 and stackabletech/issues#712.
Decision was in #330.

Needs stackabletech/operator-rs#1142 from operator-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.
• Helm chart can be installed and deployed operator works
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible
• Links to generated (nightly) docs added
• Release note snippet added

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
• Links to generated (nightly) docs added
• Release note snippet added
• Add type/deprecation label & add to the deprecation schedule
• Add type/experimental label & add to the experimental features tracker

Release notes

Added:

You can now configure serviceOverrides on ListenerClass.spec.serviceOverrides similar to podOverrides on your stacklets. This enables you to make arbitrary modification to the created Services.

[NickLarsenNZ]

LGTM