Instance feature gap for disk related fields

[karolgorc]

Reopen #12672

fixed the error with guest_os_features causing this to be breaking

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compute: added several `boot_disk`, `attached_disk`, and `instance_encryption_key` fields for improved encryption key support in `google_compute_instance` and template resources

compute: added support for `image_encryption_key.raw_key` and ` image_encryption_key.rsa_encrypted_key` to `google_compute_image` resource

compute: added support for `snapshot_encryption_key.rsa_encrypted_key` to `google_compute_snapshot` resource

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