imp: allow memo strings instead of keys for transfer authorizations (backport #6268)

[mergify]

Description

closes: #6095

---

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Summary by CodeRabbit

• Documentation

  • Updated the description of AllowedPacketData in the TransferAuthorization documentation to specify JSON-encoded memo strings.

• New Features

  • Revised the handling of memo data in authorization processes to utilize JSON-encoded memo strings instead of packet data keys.

• Refactor

  • Simplified the validateMemo function, enhancing memo validation efficiency and clarity.

---

This is an automatic backport of pull request #6268 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 0a22b7a has failed:

On branch mergify/bp/release/v8.3.x/pr-6268
Your branch is up to date with 'origin/release/v8.3.x'.

You are currently cherry-picking commit 0a22b7a2.
  (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:   modules/apps/transfer/types/authz.pb.go
	modified:   modules/apps/transfer/types/keys.go
	modified:   modules/apps/transfer/types/transfer_authorization_test.go
	modified:   proto/ibc/applications/transfer/v1/authz.proto

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	deleted by us:   docs/docs/02-apps/01-transfer/08-authorizations.md
	both modified:   modules/apps/transfer/types/transfer_authorization.go

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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