Part of this epic stackabletech/issues#241

Acceptance criteria

• Resource requests and limits are configurable in CRD using the common structs from operator-rs
• Resource requests and limits are configured for Kubernetes pods
• Resource requests and limits are configured in the product (e.g. "-Xmx" etc. for Java based images)
• Adapt/Add integration tests to specify and test correct amount of resources
• Adapt/Add examples
• Adapt documentation: New section in usage.adoc with product specific information and link to common shared resources concept
• Optional: Use sensible defaults for each role (if reasonable and applicable) and document accordingly in usage.adoc
• Code contains useful comments
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)
• Helm chart can be installed and deployed operator works (or not applicable)
• Feature Tracker has been updated
• Followup tickets have been created if needed (e.g. to update demos)