Feature request: Allow sending file with a Stream instead of filePath

[garbidge]

Feel free to close this if the change is unwanted, I thought it could be useful though.

Currently when sending a file, a filePath is required so there has to be a saved file to read from. I believe it would also be useful to be able to provide a Stream, for example in use cases such as:

• Creating the CSV file in memory without having it saved to disk.
• Accepting an uploaded file on a server and passing the stream in directly without first saving it to disk.

I've added an overload for the existing methods that takes a Stream and file name