Double free in C Stream Interface

[wjones127]

Describe the bug

Got a double free when consuming a stream and trying to return the error. Right now the C Stream Interface import tries to take ownership of the error string, but once the release callback is called that string gets freed.

arrow-rs/arrow/src/ffi_stream.rs

Lines 317 to 327 in f16ceed

	let error_str = unsafe {
	let c_str =
	self.stream.get_last_error.unwrap()(&mut self.stream) as *mut c_char;
	CString::from_raw(c_str).into_string()
	};
	if let Err(err) = error_str {
	Some(err.to_string())
	} else {
	Some(error_str.unwrap())
	}

From the C stream interface docs:

The returned pointer is only guaranteed to be valid until the next call of one of the stream’s callbacks. The character string it points to should be copied to consumer-managed storage if it is intended to survive longer.

To Reproduce

Expected behavior

We should probably clone the string as suggested by the interface docs.

Additional context

[tustvold]

label_issue.py automatically added labels {'arrow'} from #4660