Feature Request: Abstract the acquisition of a scratch org behind configuration.

[codefriar]

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As a Metecho user with a moderately complex org, it can take ~90 minutes for a scratch org to be spun up. Our internal solution to this at Chief is to use scratch org pooling. I would love to be able to configure how Metecho acquires a scratch org, so that I can direct Metecho to 'adopt' a scratch org, rather than create a net new one.