chore: ensure metrics are correctly exposed

[xeniape]

Description

Part of stackabletech/issues#747
This PR adds Prometheus annotations and adds a pod port for metrics

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

[adwk67]

LGTM:

Nit: In the Hive PR Malte replaced these with callouts from operator-rs: https://github.com/stackabletech/druid-operator/pull/761/files#diff-8df1bae7fe400b1c62e55f2dca18cd143b8a7994f7d8fe5a41fd7954f4627aaaR112-R119

[xeniape]

LGTM:

Nit: In the Hive PR Malte replaced these with callouts from operator-rs: https://github.com/stackabletech/druid-operator/pull/761/files#diff-8df1bae7fe400b1c62e55f2dca18cd143b8a7994f7d8fe5a41fd7954f4627aaaR112-R119

Yep thank you! Sorry, took a while, wanted to finish the hbase PR first :) d6fb58d

[adwk67]

Thanks!