Introduce improved cookie container #15
Description
The memory cookie provider from the core has way too many problems to be the ultimate solution. Therefore, AngleSharp.Io should start introducing a better version - handling all sorts of cookies and introducing (optional) save-to-disk capabilities.
For the latter the persistent vs. session cookie question is important. To be flexible AngleSharp.Io should work against a file system abstraction that comes with a default implementation. For the moment, this should be as lightweight as possible.
Writing the cookie handling from scratch may be tedious, but should be ultimately rewarding.