Add state export in CI

[jackzampolin]

Add a test in CI that exports network state from a simulation and tries to import it to start a new chain.

[cwgoes]

We need a way to compare two states, equality of root hash won't work since IAVL is insertion-order-dependent. I guess we can iterate through the whole keyspace of each store and compare key-by-key? Might be time-consuming but I can't immediately think of a faster way.

Any ideas @ValarDragon?

[ValarDragon]

That's the only option which immediately comes to mind, without changing data structure / representation. (Storing every state chsnge would absolutely be more expensive)

I guess it shouldn't be too slow if it's from a simulation created in CI

[alexanderbez]

Does it not suffice to just check the app hash?

[ValarDragon]

equality of root hash won't work since IAVL is insertion-order-dependent

Because of that, the app hashes won't be the same.

[alexanderbez]

Ohhh right. Derp. Ok, I guess we can do direct store comparisons.

[cwgoes]

Dump to a file for comparison and ease-of-inspection, format e.g.

# STORE = "stake", HEIGHT = 123
(<KEY BYTES>\t<VALUE BYTES>\n)*
# STORE = "gov", HEIGHT = 123
(<KEY BYTES>\t<VALUE BYTES>\n)*