ACL support

[hrchu]

AS-IS:
solid-file-python cannot manipulate ACL in a solid pod.

TO-BE
As a user, I can use ACL management functions to set ACL for my resources.

Need to clarity:
We have two candidate approaches to implement it.

• WAC: The standard way to do this. Supported by all mainstream implementations, but Inrupt claims there are known security issues with WAC.
• ACP: supported by ESS only, may be part of spec in the future.

Reference

• https://docs.inrupt.com/developer-tools/javascript/client-libraries/tutorial/manage-access/
• https://solidproject.org/TR/protocol#authorization
• https://solid.github.io/web-access-control-spec/
• https://solid.github.io/authorization-panel/authorization-ucr/
• https://github.com/jeff-zucker/solid-file-client#acl-management