[ENH] - Provide a liveliness check for storage

**Is your feature request related to a problem? Please describe.**
CouchDB provided an error on Read-Only storage but did not trigger the readiness check on the _up endpoint (default provided readiness check).

**Describe the solution you'd like**
I propose the current readiness check be moved to liveliness and readiness be similar to sh -c 'touch /opt/couchdb/data/.ready'. If it exits != 0 for storage issues the pod will reset which would trigger a storage mount refresh.

**Describe alternatives you've considered**
I've made this change in local system. It works.

Start at the chart's Kubernetes probe configuration and compare the current _up readiness check with the proposed liveness check. Review how the /opt/couchdb/data/.ready touch command would represent storage readiness, then verify that a nonzero result causes the intended pod restart and that readiness remains separate.

Written by the indexing model from the issue text.