bug: multiple file with same name in google drive crash

### Describe the bug

While _debugging_ and trying to list a google drive, if multiple files have the same name exactly, the application crash.
For some reason, GoogleDrive allows multiple files to have exactly the same name.

This is handled [here](https://github.com/apache/opendal/blob/cf7b9ab61c79f85a9f78a90a7f338d09dfc749a5/core/src/raw/path_cache.rs#L99) and this check is disabled in release mode.

### Steps to Reproduce

Connect to a google drive with two files having exactly the same name and do a `op.list(...)`

### Expected Behavior

I guess the simplest is to completely ignore the file and not crash or simply log an error somewhere.

At least, the error and comment should be more precise.

### Additional Context

I'm new to the library, sorry if it's the expected behavior or if there's another issue about it. I couldn't find anything about that.

### Are you willing to submit a PR to fix this bug?

- [ ] Yes, I would like to submit a PR.

Start at core/src/raw/path_cache.rs around the linked check and reproduce the issue by calling op.list(...) on a Google Drive containing duplicate filenames. Determine the intended handling for duplicate names; done means listing no longer crashes and the error or comment accurately describes the behavior.

Written by the indexing model from the issue text.