Add cascade and node privileges to JSON enterprise role

[lthievenaz-keeper]

Currently running enterprise role in text format yields cascade permissions and node privileges:
er -v 'Keeper Administrator' --format text
This isn't included in the JSON output:
er -v 'Keeper Administrator' --format json

This commit adds the same logic as the text format (ignoring hidden privileges or MSP privileges if user is not MSP), and shows the result in the following format (verbose flag is not required):

"managed_nodes": [
        {
            "node_id": 1067368092532738,
            "node_name": "Demo Node",
            "cascade": true,
            "privileges": [
                "manage_user",
                "manage_nodes",
                "manage_roles",
                "manage_teams",
                "transfer_account",
                "run_reports",
                "manage_bridge",
                "manage_record_types",
                "approve_device",
                "run_compliance_reports",
                "sharing_administrator"
            ]
        }
    ],

[lthievenaz-keeper]

If a role has multiple managing nodes, this is an example output:

"managed_nodes": [
        {
            "node_id": 1067368092532738,
            "node_name": "Keeper Demo",
            "cascade": false,
            "privileges": [
                "sharing_administrator"
            ]
        },
        {
            "node_id": 1067368092532743,
            "node_name": "EU",
            "cascade": false,
            "privileges": [
                "sharing_administrator"
            ]
        }
    ],