Keep CVM log when forking context with a different address

[helins]

Is there any reason not to keep the current CVM log when using Context.forkWithAddress()?

In the Convex Shell, forkWithAddress() would be useful for switching accounts while minimizing any other state.

[mikera]

I believe the only reason it doesn't do that currently is that it was originally intended for testing purposes where you want a new "fresh" context (i.e. just with the same state, otherwise similar to what you would have at the start of a transaction). It's very dangerous to change address otherwise so this isn't intended for production on-chain usage.

No reason why we can't have a separate version that keeps the log though. It's all fine for off-chain usage.