feat: add regionmanagedinstancegroups

[nsilve]

Description

It adds support for Regional MIGs as well as updating some dependencies.
Listing managed instances of a Regional MIG is added by supporting the custom ManagedInstances field in addition to existing Items one and by adding the ListManagedInstances option with custom templates.

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Rel: #71

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: nsilve
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[google-oss-prow]

Hi @nsilve. Thanks for your PR.

I'm waiting for a GoogleCloudPlatform member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[bowei]

Missing CLA

[bowei]

I'm going to close this request, please sign the CLA and send a new PR.