(feat) Add possibility to transfer entire balance. (backport #6877)

[mergify]

Description

closes: #6567

---

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• Targeted PR against the correct branch (see CONTRIBUTING.md).
• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Code follows the module structure standards and Go style guide.
• Wrote unit and integration tests.
• Updated relevant documentation (docs/).
• Added relevant godoc comments.
• Provide a conventional commit message to follow the repository standards.
• Include a descriptive changelog entry when appropriate. This may be left to the discretion of the PR reviewers. (e.g. chores should be omitted from changelog)
• Re-reviewed Files changed in the GitHub PR explorer.
• Review SonarCloud Report in the comment section below once CI passes.

---

This is an automatic backport of pull request #6877 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 92e1f38 has failed:

On branch mergify/bp/release/v8.4.x/pr-6877
Your branch is up to date with 'origin/release/v8.4.x'.

You are currently cherry-picking commit 92e1f387.
  (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:   testing/chain.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/compatibility-test-matrices/main/transfer-v2-multidenom-chain-a.json
	deleted by us:   .github/compatibility-test-matrices/release-v9.0.x/transfer-v2-multidenom-chain-a.json
	deleted by us:   .github/compatibility-test-matrices/unreleased/transfer-v2-multidenom.json
	both modified:   CHANGELOG.md
	deleted by us:   docs/docs/02-apps/01-transfer/04-messages.md
	deleted by us:   docs/docs/02-apps/01-transfer/10-ICS20-v1/04-messages.md
	deleted by us:   e2e/tests/transfer/base_test.go
	both modified:   modules/apps/transfer/keeper/relay.go
	both modified:   modules/apps/transfer/keeper/relay_test.go
	deleted by us:   modules/apps/transfer/types/token.go
	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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[damiannolan]

do we need compatibility tests on release branches? me thinks no

[DimitrisJim]

do we need compatibility tests on release branches? me thinks no

would agree, we so far keep em in other releases from what I see but don't see whjy

[damiannolan]

LGTM!

[damiannolan]

we can remove

[damiannolan]

ditto

[damiannolan]

ditto