Move binary search from osmomath to osmoutils (backport #3763)

[mergify]

This is an automatic backport of pull request #3763 done by Mergify.
Cherry-pick of 3095a7d has failed:

On branch mergify/bp/v13.x/pr-3763
Your branch is up to date with 'origin/v13.x'.

You are currently cherry-picking commit 3095a7d3.
  (fix conflicts and run "git cherry-pick --continue")
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Changes to be committed:
	modified:   CHANGELOG.md
	renamed:    osmoutils/binary_search_test.go -> osmomath/binary_search_test.go
	modified:   osmomath/math.go
	deleted:    osmoutils/binary_search.go
	modified:   x/gamm/pool-models/balancer/util_test.go
	modified:   x/gamm/pool-models/internal/test_helpers/test_helpers.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	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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