Add support for path args appearing in JSON args as well

[wrouesnel]

Some Unifi requests (such as rest/firewallgroup) use the _id field as both a path parameter and part of the JSON arguments when being being updated by PUT requests.

This change adds the path_arg_in_request_body keyword parameter to UnifiAPICall which indicates the path_parameter should be replicated into the JSON request dict as well.

Example Usage

I've successfully used this modification to support updating firewall groups on software based unifi controller.

list_firewallgroups = UnifiAPICall(
    """List the detail of firewall groups

    Returns:
        List of dictionaries with firewall groups
    """,
    "rest/firewallgroup",
)

create_firewallgroup = UnifiAPICall(
    """Create a firewall group

    Returns:
        List of dictionaries with firewall groups
    """,
    "rest/firewallgroup",
    json_args=[
        "group_type",
        "name",
        "group_members",
    ],
    method="POST",
)

set_firewallgroup = UnifiAPICall(
    """Update an existing firewall group

    Returns:
        List of dictionaries with firewall groups
    """,
    "rest/firewallgroup",
    path_arg_name="_id",
    path_arg_optional=False,
    path_arg_in_request_body=True,
    json_args=[
        "site_id",
        "group_type",
        "name",
        "group_members",
    ],
    method="PUT",
)