✨ Add supports to Crypto Spec in VMOp VirtualMachine and PVC

[laozc]

What this PR does / why we need it:

Add new fields to opt-in EncryptionClass name on volumes

    // +optional
    EncryptionClassName *string `json:"encryptionClassName,omitempty"`

and VMOp.Crypto

    // Crypto describes the desired encryption state of the VirtualMachine.
	// +optional
	Crypto *VirtualMachineCryptoSpec `json:"crypto,omitempty"`

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[zjs]

Overall, LGTM

[zjs]

suggestion: It may be useful to document somewhere (perhaps just in the PR description) why this is a *string instead of the string used by VM Operator.