WebDAV support in the Transfer-Service

[jgoldverg]

Problem: Http does not fundamentally support uploading files, as it is very API specific to the server we are uploading too.

Solution: WebDAV is an extension of the HTTP protocol that enables users to upload files to a WebDAV server by utilizing the HTTP protocol. This enables very performant transfers as HTTP supports (concurreny, parallelism, pipelininig). We want to implement a WebDAV reader and a WebDAV writer to enable IO for our users.

The library to use is: https://github.com/lookfirst/sardine/ feel free to explore other options but from inital looks sardine is a good choice as apache has deprecated support for JackRabbit.