fix: read/write large file (>2GB)

[fMeow]

hdrs raises a critical error when reading/writing a large file to hdfs. This is due to the length limit of a single hdfsRead call. I tested with a file of 40G, but I think any file that is larger than 2GB will face the same issue.

The length parameter requires an i32, which is at most 2^31-1. Though I have tried that length size and only get an out of memory error. Thus I think it safer to limit the length to 2^30 bytes.

This patch is inspired by the rust underlying implementation of Write to File.

After this patch, it's advisable to use write_all instead of write, and read_to_end instead of read.

[Xuanwo]

Thanks for your PR! Mostly LGTM, I'm glad to merge it after all comments addressed 💯