osmomath: mutative and efficient BigDec truncations with arbitrary decimals (backport #6261)

[mergify]

This is an automatic backport of pull request #6261 done by Mergify.
Cherry-pick of d5c8abc has failed:

On branch mergify/bp/v19.x/pr-6261
Your branch is up to date with 'origin/v19.x'.

You are currently cherry-picking commit d5c8abca.
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Changes to be committed:
	modified:   osmomath/decimal.go
	modified:   osmomath/decimal_test.go
	modified:   simulation/simtypes/random/sdkrand.go
	modified:   x/concentrated-liquidity/math/tick.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   go.mod
	both modified:   go.sum
	both modified:   x/epochs/go.mod
	both modified:   x/epochs/go.sum

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[p0mvn]

Synched through epoch on a node as well