Add Permissions for accessing certain data

[razmikarm]

Create different types of Permissions and implement functionality to mark endpoints with certain Permissions. Access is also can vary depending on ownership of a subject or existing relationship.

[razmikarm]

First of all need to design the architecture and the flow of the usage of Permissions. Will start implementation after clarification.

[razmikarm]

Marking as ON HOLD, because need to implement more subjects and endpoints to have more accurate idea on this issue.