[stableswap]: Convert all core stableswap arithmetic to use BigDec
#2777
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Closes: #2776
What is the purpose of the change
This PR updates all core arithmetic operations in stableswap to use our
BigDec
type instead of the regularsdk.Dec
type.Brief Changelog
sdk.Dec
for internal calculations to useBigDec
sdk.Dec
toBigDec
and vice versa to ourBigDec
implementationTesting and Verifying
sdk.Dec
andBigDec
have the same precision, but this change will require more thorough testing once we increase precision bounds inBigDec
sdk.Dec
<->BigDec
only have basic sanity tests, as testing them more thoroughly requires finalizing the specific decimal precision we want forBigDec
(left for a future PR to not block this one)Documentation and Release Note
Unreleased
section inCHANGELOG.md
? (yes / no)