Impl(backend): add pvc data fetch api functionality

[Tanmay-21]

Implements #258
Closes #258

Description

This PR adds support for fetching PersistentVolumeClaims data on /resource endpoint in cyclops-ctrl.

[petar-cvit]

@Tanmay-21 thanks for the PR. Left one comment for the PVC struct

[petar-cvit]

Can you fix this as well? Also, do we need to checkout for nil pointer dereference if Storage is nil?

[Tanmay-21]

we need deleted value populated here as false?

[Tanmay-21]

Also I think storage is a necessary field in PVCs so might never be nil

[petar-cvit]

This does not compile. You should .Spec.AccessModes with capital letters

[petar-cvit]

Also I think storage is a necessary field in PVCs so might never be nil

I was thinking the same thing, but would still like to be cautious since we are dealing with pointers. If its nil, you can default to 0

[Tanmay-21]

Added

[petar-cvit]

LGTM

[petar-cvit]

Thanks @Tanmay-21!