feat(client): use address codec for tx.Sign (backport #21436)

[mergify]

Description

Closes: #21430

We can use a client.Context in tx.Sign as it contains an address codec.
The change is minimally breaking as we always have a client.Context available when using tx.Sign and client.Context contains as well the command context.

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• included the necessary unit and integration tests

• added a changelog entry to CHANGELOG.md

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This is an automatic backport of pull request #21436 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 01abf4f has failed:

On branch mergify/bp/release/v0.52.x/pr-21436
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 01abf4fbf.
  (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:   client/tx/tx.go
	modified:   client/tx/tx_test.go
	modified:   simapp/simd/cmd/testnet.go
	modified:   simapp/v2/simdv2/cmd/testnet.go
	modified:   testutil/cli/cmd.go
	modified:   testutil/network/network.go
	modified:   x/auth/client/tx.go

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

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

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