feat: nested total count

[Bramw2003]

In our pagination we have the 'total-count' for a list nested in a cursor object like

{
    data: {...},
    meta: {
        cursor: {
            total-count: 1234
        }
    }
}

This PR adds support for a nested total count and closes #40

[Bramw2003]

Guessing this isn't the most optimised way to do this but suggestions are welcome!