Allow to call init and debug inner field in a test module

[yanganto]

Steps to Reproduce Issue

The following repo shows the restrictions about the testcase in a different file.
https://github.com/yanganto/SuiMoveTestIssue

The demo1 and demo2 are the same, and the testcases are the same, the only different is one is in the module and the other is in the test module.

1. Call sui move test under /demo1
2. Call sui move test under /demo2

Expected Result

Expected the demo2 should pass.
Specify what outcome you expected should have resulted, but didn't.

Actual Result

The test of demo2 fails, due to the visibility issue.

System Information

• OS: NixOS
• Compiler: Rust 1.81

[yanganto]

Hi, I update the readme of the repo, and also propose a solution for this.
https://github.com/yanganto/SuiMoveTestIssue/pull/3/files

If this proposal looks good, and the issue is a not urgent one, I will happy to work on this and make a PR here.