feat!(template): Added option to set stack_type of instance_template

[danielgronberg]

BEGIN_COMMIT_OVERRIDE
feat(template)!: Added option to set stack_type of instance_template #251
END_COMMIT_OVERRIDE

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[bharathkkb]

Thanks for the PR @danielgronberg
Can we also bump the min provider version to 3.88 when this was added to the provider https://github.com/hashicorp/terraform-provider-google/blob/v3.90.1/CHANGELOG.md#3880-october-11-2021

terraform-google-vm/modules/instance_template/versions.tf

Line 20 in 5792db1

google = ">= 3.43, < 5.0"

[legal90]

@bharathkkb The minimal provider version has been bumped. Could you please review this PR again?

[apeabody]

Thanks for the contribution @danielgronberg!