Add ListenerOperatorVolumeSourceBuilder::build_pvc

[nightkr]

Description

Persistent analogue of ::build() that is suitable for deploying directly, or for adding to a StatefulSet. Also renamed ::build() to ::build_ephemeral() for parity (and to clarify that it isn't, and shouldn't be, the default).

Extracted from https://github.com/stackabletech/hdfs-operator/pull/450.

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
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# Author

# Reviewer
- [x] Code contains useful comments
- [x] Documentation added or updated
- [x] Changelog updated
- [x] 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