Have a way to fork mainnet

[OxMarco]

It would be nice to have a way to fork the status of a network, in order to run "stateful" tests.
This issue is particularly relevant when testing contracts that interact with other primitives, like lending protocols or oracles, where setting up the state manually in a test is not trivial.

[stxer]

We're running this experimental project, it's still in internal testing phase but might already be very helpful to many use cases including yours.

https://stxer.xyz/simulations

[lgalabru]

Related: lgalabru/stacks-core#1

[hugocaillard]

Thanks for surfacing this issue @OxMarco.
I'm closing this issue in favor of a more formal one: #1503.

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