feat: implement multi-send transaction command (backport #11738)

[mergify]

This is an automatic backport of pull request #11738 done by Mergify.
Cherry-pick of 6a9b824 has failed:

On branch mergify/bp/release/v0.46.x/pr-11738
Your branch is up to date with 'origin/release/v0.46.x'.

You are currently cherry-picking commit 6a9b8247f.
  (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:   CHANGELOG.md
	modified:   types/coin.go
	modified:   types/coin_test.go
	modified:   x/auth/client/cli/tx_multisign.go
	modified:   x/bank/client/testutil/cli_helpers.go
	modified:   x/bank/client/testutil/cli_test.go
	modified:   x/bank/client/testutil/suite.go
	modified:   x/bank/types/msgs_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x/bank/client/cli/tx.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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