Add desired_status argument to google_compute_instance

[rileykarson]

Upstreams hashicorp/terraform-provider-google#4797

hashicorp/terraform-provider-google#4797 (comment) is probably a helpful reference for behaviour. Tests have been changed a little since they made the table, but they roughly match.

I applied some docs changes during the (manual) upstreaming, since the script didn't like doing that many commits. They'll get applied by the Magician during the sync.

Release Note Template for Downstream PRs (will be copied)

compute: added the ability to manage the status of `google_compute_instance` resources with the `desired_status` field

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[rileykarson]

No CLA is required, as this change is to a third_party directory where the CLA does not apply.

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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 837 insertions(+), 52 deletions(-))
Terraform Beta: Diff ( 3 files changed, 837 insertions(+), 52 deletions(-))

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 832 insertions(+), 47 deletions(-))
Terraform Beta: Diff ( 3 files changed, 832 insertions(+), 47 deletions(-))