invalid error BUFFER_BYTE_LENGTH_MISMATCH on > 4GB files

getting

```
{
"code": "BUFFER_BYTE_LENGTH_MISMATCH",
"message": "Actual data byte length (1839500092) is less than the declared buffer byte length (10429434684).",
"severity": 0,
"pointer": "/buffers/0"
}
```

despite the provided buffer file having the proper size

used [gltf_validator-2.0.0-dev.3.10-win64.zip](https://github.com/KhronosGroup/glTF-Validator/releases/download/2.0.0-dev.3.10/gltf_validator-2.0.0-dev.3.10-win64.zip)

Start by reproducing the report with gltf_validator-2.0.0-dev.3.10-win64 and the reported buffer size. Trace the buffer byte-length validation entry point; done means a correctly sized buffer larger than 4 GB is not reported as BUFFER_BYTE_LENGTH_MISMATCH, with a regression check for this case.

Written by the indexing model from the issue text.