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GH-43994: [C++][Parquet] Fix schema conversion from two-level encoding nested list (#43995)

### Rationale for this change

The current C++ parquet implementation interprets following parquet schema as `array<struct<array:array<int>>>, which is wrong:
```
  optional group a (LIST) {
    repeated group array (LIST) {
      repeated int32 array;
    }
  }
```

### What changes are included in this PR?

According to the parquet spec, the above schema should be inferred as `array<array<int>>`.

### Are these changes tested?

Yes, a test case has been added to verify the fix.

### Are there any user-facing changes?

No.
* GitHub Issue: #43994

Authored-by: Gang Wu <ustcwg@gmail.com>
Signed-off-by: Gang Wu <ustcwg@gmail.com>