Delete osmomath.BigDec.ApproxRoot

[ValarDragon]

Summary

As far as I can tell, this is only used to derive some constants in a stableswap test. We can just hardcode those constants, and get this code out of the repo.

Problem Definition

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Proposed Feature

Delete code

[jbsummoner]

used here too

[ValarDragon]

Ah thanks! Maybe we should just move that solve_cfmm_direct function to testing and approx root to testing in stableswap then.

Neither is used in the production state machine