Add support for disk config on the GKE Node Auto provisioning

[modular-magician]

In this PR, I've added the feature to pass the disk_size and disk_type on the GKE node auto provisioning defaults to specify and change the default values on the provisioned nodes by NAP.

Related Configurations on the Google API: Link
Related issue: hashicorp/terraform-provider-google#12722

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Release Note Template for Downstream PRs (will be copied)

container: Added support for the Disk type and size configuration on the GKE Node Auto-provisioning

Derived from GoogleCloudPlatform/magic-modules#6649