Provide charm configuration to RBD Storage class parameters

[Adam Dyess]

the 1.29/stable and 1.30/stable charm try to apply parameters that are no longer valid to the RBD Storage class resources

for instance: thickProvision has been deprecated from ceph-csi https://github.com/ceph/ceph-csi/pull/2589 but the charm still applies it. This creates conflicts when upgrading a 1.28/stable cluster from cdk-addons controlled ceph to ceph-csi.

We should have charm config that allows for setting and removal of rbd-storage-class-parameters

[Adam Dyess (addyess)]

in fact, the ceph-csi charm can get into a loop trying to apply changes to parameters of storage classes:

https://pastebin.canonical.com/p/B96N9rmDkw/

[Adam Dyess (addyess)]

https://github.com/charmed-kubernetes/ceph-csi-operator/pull/20

[Adam Dyess (addyess)]

installers of this charm with this change should likely always deploy like this:

```
juju deploy ceph-csi --channel=1.29/stable \
--config ceph-xfs-storage-class-parameters='thickProvision-' \
--config ceph-ext4-storage-class-parameters='thickProvision-'
```

this parameter isn't required any longer, but cannot be defaulted to 'thickProvision-' because it would break existing installations. StorageClassParameters cannot be patched after the storage class is installed.

[Adam Dyess (addyess)]

Both need to be resynced to 1.29 and 1.30 branches:
https://github.com/charmed-kubernetes/ceph-csi-operator/pull/20
https://github.com/charmed-kubernetes/ceph-csi-operator/pull/21

[Adam Dyess (addyess)]

Backported to release_1.29 and release_1.30 branches