refactor(osmoutils): use Dec for additive tolerance instead of Int (backport #3711)

[mergify]

This is an automatic backport of pull request #3711 done by Mergify.
Cherry-pick of 5ab7ebf has failed:

On branch mergify/bp/v13.x/pr-3711
Your branch is up to date with 'origin/v13.x'.

You are currently cherry-picking commit 5ab7ebf6.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   osmomath/binary_search_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   osmomath/binary_search.go
	both modified:   x/gamm/pool-models/balancer/pool_test.go
	both modified:   x/gamm/pool-models/internal/cfmm_common/lp.go
	both modified:   x/gamm/pool-models/stableswap/amm.go
	both modified:   x/gamm/pool-models/stableswap/amm_test.go

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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[ValarDragon]

Cherry-picking in #3816