Function py_ensure_file_exists_or_download_http 

pub fn py_ensure_file_exists_or_download_http(
    py: Python<'_>,
    filepath: &str,
    url: &str,
    checksums: Option<&str>,
    timeout_secs: Option<u64>,
) -> PyResult<()>

Python wrapper for ensure_file_exists_or_download_http.

Ensures that a file exists at the specified path by downloading it if necessary.

Errors

Returns an error if:

• The HTTP request fails or returns a non-success status code: PyErr.
• Any I/O operation fails during file creation, reading, or writing: PyErr.
• Checksum verification or JSON parsing fails: PyErr.