V8 stack management

[simonjjones]

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Description of the Change

This PR covers the CLI implementation details for RFC-0045: Enhance Stack Handling in Cloud Foundry. It adds an additional state field to output of the cf stack, cf stacks & cf update-stack commands, as well as adding the ability to modify the state to the cf update-stack command. This is a partner PR to the existing Cloud Controller changes submitted for review

Why Is This PR Valuable?

These changes will be required for consumers to interact with the new features available in the Cloud Controller, the RFC has been accepted, indicating the changes are valuable.

Applicable Issues

N/A

How Urgent Is The Change?

This should be accepted and released in line with the changes being proposed to the Cloud Controller

Other Relevant Parties

The Cloud Controller changes linked above should detail other people impacted.