api!: rename path to merkle path for contract api json msgs (backport #6962)

[mergify]

Description

This was already merged in the release branches, but not yet in main.

closes: #XXXX

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• 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 #6962 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 5a6b4ae has failed:

On branch mergify/bp/08-wasm/release/v0.5.x+ibc-go-v9.0.x-wasmvm-v2.1.x/pr-6962
Your branch is up to date with 'origin/08-wasm/release/v0.5.x+ibc-go-v9.0.x-wasmvm-v2.1.x'.

You are currently cherry-picking commit 5a6b4ae0.
  (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/light-clients/08-wasm/types/contract_api.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   modules/light-clients/08-wasm/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

[sonarcloud]

Quality Gate passed for 'ibc-go'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud