feat(x/tx): add an option to encode maps using amino json (backport #23539)

[mergify]

Follow-up of #23513

Afterwards i'll cherry-pick this in x/tx v0.13 after Noble's request. v0.13 is present in release/v0.50.x branch, hence the backport to that branch. v1 is tagged from main.
Then I'll bump in autocli.

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title, you can find examples of the prefixes below:

• confirmed ! in the type prefix if API or client breaking change

• targeted the correct branch (see PR Targeting)

• provided a link to the relevant issue or specification

• reviewed "Files changed" and left comments if necessary

• included the necessary unit and integration tests

• added a changelog entry to CHANGELOG.md

• updated the relevant documentation or specification, including comments for documenting Go code

• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

Please see Pull Request Reviewer section in the contributing guide for more information on how to review a pull request.

I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic, API design and naming, documentation is accurate, tests and test coverage

Summary by CodeRabbit

Release Notes

• New Features

  • Added map marshalling support to the Amino JSON encoder
  • Improved handling of map and list types during JSON marshaling

• Testing

  • Enhanced test coverage for map marshalling functionality
  • Removed debugging print statements from existing tests

• Changelog

  • Updated changelog with new versions v1.1.0 and v0.13.7

These updates improve the robustness and flexibility of the JSON encoding process, particularly for map and list data types.

---

This is an automatic backport of pull request #23539 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of aef1a2a has failed:

On branch mergify/bp/release/v0.50.x/pr-23539
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit aef1a2a06.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x/tx/CHANGELOG.md
	both modified:   x/tx/signing/aminojson/json_marshal.go
	both modified:   x/tx/signing/aminojson/json_marshal_test.go

no changes added to commit (use "git add" and/or "git commit -a")

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

[julienrbrt]

I'll fix this