osmomath: QuoTruncate with no reallocation (backport #6428)

[mergify]

This is an automatic backport of pull request #6428 done by Mergify.
Cherry-pick of 114f055 has failed:

On branch mergify/bp/v19.x/pr-6428
Your branch is up to date with 'origin/v19.x'.

You are currently cherry-picking commit 114f055f.
  (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/decimal.go
	modified:   osmomath/decimal_test.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/concentrated-liquidity/math/math.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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[p0mvn]

@hieuvubk please help with conflicts on this backport ser

[p0mvn]

@hieuvubk please help with conflicts on this backport ser

NVM. Resolved