chore: forbid invalid parameters in snapshot storage class

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
chore: forbid invalid parameters in snapshot storage class

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

none

[wozniakjan]

/lgtm

but I think it will not respect the error type

csi-driver-nfs/pkg/nfs/controllerserver.go

Lines 313 to 315 in 8cee281

	snapshot, err := newNFSSnapshot(req.GetName(), req.GetParameters(), srcVol)
	if err != nil {
	return nil, status.Errorf(codes.NotFound, "failed to create nfsSnapshot: %v", err)

nit: is it desirable to also have a similar check for StorageClass parameters in newNFSVolume()?

csi-driver-nfs/pkg/nfs/controllerserver.go

Lines 603 to 620 in 8cee281

	for k, v := range params {
	switch strings.ToLower(k) {
	case paramServer:
	server = v
	case paramShare:
	baseDir = v
	case paramSubDir:
	subDir = v
	case paramOnDelete:
	onDelete = v
	case pvcNamespaceKey:
	subDirReplaceMap[pvcNamespaceMetadata] = v
	case pvcNameKey:
	subDirReplaceMap[pvcNameMetadata] = v
	case pvNameKey:
	subDirReplaceMap[pvNameMetadata] = v
	}
	}

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, wozniakjan

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