…485)

**What this PR does / why we need it**:

This PR adds `extraVolumeClaimTemplates` value for write loki component,
it allows to have more than one volume claims for persistent statefulset
configuration. For example, when it's needed to have ingester's and
shipper's WAL files on different persistent volumes.

**Special notes for your reviewer**:

**Checklist**
- [X] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [X] Documentation added
- [x] Tests updated
- [x] `CHANGELOG.md` updated
- [x] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/upgrading/_index.md`

---------

Co-authored-by: J Stickler <julie.stickler@grafana.com>