add pool state transition funcs to interface

[dpaiton]

First outlined here: #1010 which was closed in favor of this issue.

We want to be able to estimate the future value of a trade as well as predict all outcomes of trades wrt user, pool, fees in base and shares.

Both this task and delvtech/hyperdrive-rs#39 require implementing "pool delta" calc functions.

[dpaiton]

depends on delvtech/hyperdrive-rs#39

[wakamex]

for reference, the accuracy of the python version of predict_trade is too high (#1357).
in implementing a rust equivalent, we should ensure it's more accurate.

[wakamex]

the first link is for measuring the current value of all your positions