✨ 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"`

VirtualMachineCryptoSpec.Crypto

type VirtualMachineCryptoSpec struct {
   EncryptionClassName *string `json:"encryptionClassName,omitempty"`
   UseDefaultKeyProvider *bool `json:"useDefaultKeyProvider,omitempty"`
}

Note: The EncryptionClassName changed to use *string because of the API lint in CAPV.

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

[zhanggbj]

/lgtm
Overall LGTM, just left some nits.

[zhanggbj]

Since Encryption Class is backported to VMOP API later than VM AF/AAF, will update PR #3655 to use this commit.

Also CC @fabriziopandini @sbueringer for awareness.

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 82929e1a102a4d6b7974fbb89c7bc5dccfae8393

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[silvery1622]

Left some comments regarding the validation rules for VirtualMachineCryptoSpec and the existence validation for EncryptionClass.