A way to update CloudFormation StackSets created by iambic during version upgrades

[smoy]

Is your feature request related to a problem? Please describe.
An easy way to update the stacks and stacksets rather than having to remove them and recreate them.

Describe the solution you'd like
iambic upgrade-cloudformation-stacksets

optionally

iambic upgraed-cloudformation-stacksets --to-read-write

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Another suggestion would be have an easy way to update the stacks and stacksets rather than having to remove them and recreate them. Originally because I went from read only to read/write, but would also be valid if/when the policies used by it change

https://noqcommunity.slack.com/archives/C052R22L3C6/p1686923423692889

suggestion by Simon Dick

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