implement lease transfer

[bennyz]

this simply allows to update the lease with a different client

a corresponding jumpstarter cli update to
jmp update lease will be made

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch lease-transfer

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[mangelajo]

This is very cool, I believe that in the longer term we may want to create a new lease, and transfer the exporter to the new lease, end the current one.

The reason for that will be that we may want to do accounting/billing.

Also something very interesting that we can think about in the future is lease-sharing, but that is more complicated.