Add P2PNotary node role for native RoleManagement contract (#978)

* Keep native RoleManagement roles in sync with Neo core

Add missing NeoFSAlphabetNode role. We should keep this list in sync
with Core so that users are able to use these roles.

Signed-off-by: Anna Shaleva <[email protected]>

* Add documentation to native RoleManagement roles

It's nice when user-facing things are well-documented.

Signed-off-by: Anna Shaleva <[email protected]>

* Add P2PNotary node role for native RoleManagement contract

Port neo-project/neo#3172.

Signed-off-by: Anna Shaleva <[email protected]>

---------

Signed-off-by: Anna Shaleva <[email protected]>
Co-authored-by: Shargon <[email protected]>

Author: AnnaShaleva

src/Neo.SmartContract.Framework/Native/Role.cs

@@ -28,6 +28,11 @@ public enum Role : byte
         /// <summary>
         /// NeoFS Alphabet nodes.
         /// </summary>
-        NeoFSAlphabetNode = 16
+        NeoFSAlphabetNode = 16,
+
+        /// <summary>
+        /// P2P Notary nodes used to process P2P notary requests.
+        /// </summary>
+        P2PNotary = 32
     }
 }