Add invoice lines fetching for specific invoice

[tutelaris]

Is your feature request related to a problem? Please describe.

In the documentation, there is an ability to retrieve invoice lines: https://stripe.com/docs/api/invoices/invoice_lines#invoice_lines

Going through the code, I didn't find any method that can help me to retrieve invoice lines from the existing invoice. The reason I specifically need it is that we need to fetch invoice items with more than 10 items (let's say 20), so I want to tweak this param for invoice items a bit.

Describe the solution you'd like

It would be great if we could have something like:

module Stripe
  class Invoice < APIResource
    ...
    custom_method :all_lines, http_verb: :get
    ...
    def all_lines(params = {}, opts = {})
      request_stripe_object(
        method: :get,
        path: resource_url + "/lines",
        params: params,
        opts: opts
      )
    end
  end
end

Can open the PR if needed.

Describe alternatives you've considered

No response

Additional context

No response

[tutelaris]

NVM, searched through issues and found an already implemented solution. Sorry