EVEREST-1874 | support volume expansion for PXC

[mayankshah1607]

CHANGE DESCRIPTION

Problem:
EVEREST-1874

Allow PVC resizing (storage expansion) for PXC clusters:

• set pxc.spec.enableVolumeExpansion=true when storage size is increased.
• storage scaling may be prevented by setting db.spec.engine.storage.disableVolumeExpansion=true
• add new DB state resizingVolumes
• add a new conditions list in status to indicate failures related to storage resizing

CHECKLIST

Helm chart

• Is the helm chart updated with the new changes? (if applicable)

Jira

• Is the Jira ticket created and referenced properly?

Tests

• Is an Integration test/test case added for the new feature/change?
• Are unit tests added where appropriate?

[oksana-grishchenko]

Using conditions to describe the reasons looks good to me.
The idea of having the expansion enabled by default is also fine, I don't see any issues so far we could possibly face with it.
Approving the PR, left a couple of comment for consideration