[Sharing NG] Make proper use of share permissions instead of roles

[JammingBen]

With Sharing NG, roles and permissions are coming from the server. While there is a predefined set of available permissions, roles are simply a "bucket" of permissions. In the future we even may have custom roles per instance, which makes it impossible to rely on roles.

Therefore Web should switch its focus on permissions and only use/display role information if the server returns a matching role for a given set of permissions.

Acceptance criteria

• Make sure all available permissions are included in GraphSharePermission (https://github.com/owncloud/web/blob/master/packages/web-client/src/helpers/share/types.ts#L4). Check against ocis to verify this.
• Rename GraphSharePermission to DriveItemPermission
• Remove all role checks (e.g. share.role.id !== GraphShareRoleIdMap.SpaceManager) in favour of permission checks
• Remove GraphShareRoleIdMap(?) We might implement something similar for tests though? Now sure...
• Re-think the hard-coded keys of the spaceRoles property in the SpaceResource interface. These names can break when the server adds new roles or renames existing.
• Make sure that permissions are being displayed in case a set of permissions doesn't have a matching role coming from the server.
  • How do we display the permissions without cluttering the UI? We probably shouldn't list all permissions coming from the server. @tbsbdr