Add us_bank_account & more debits to PaymentMethod

[justinludwig]

Currently, the Stripe.PaymentMethod struct doesn't include a number of fields that the Stripe API uses for the type-specific details of a payment method. This change adds fields for the bank-debit payment types that are missing:

• us_bank_account
• acss_debit
• bacs_debit

Retreiving a us_bank_account payment type should now populate its us_bank_account field:

iex> Stripe.PaymentMethod.retrieve("pm_1LHCTyLbyeJk2hS7DM11RAja")
{:ok,
 %Stripe.PaymentMethod{
   acss_debit: nil,
   au_becs_debit: nil,
   bacs_debit: nil,
   billing_details: %{...},
   card: nil,
   created: 1656791998,
   customer: "cus_KKy0ZBqhtEbzGT",
   id: "pm_1LHCTyLbyeJk2hS7DM11RAja",
   link: nil,
   livemode: false,
   metadata: %{},
   object: "payment_method",
   sepa_debit: nil,
   type: "us_bank_account",
   us_bank_account: %{
     account_holder_type: "individual",
     account_type: "checking",
     bank_name: "STRIPE TEST BANK",
     financial_connections_account: "fca_1LHCSdLhelJl1gS70hOa1j2X",
     fingerprint: "xxFq7llo9dS1Z7bU",
     last4: "6789",
     networks: %{preferred: "ach", supported: ["ach"]},
     routing_number: "110000000"
   }
 }}

And retreiving a acss_debit payment type should now populate its acss_debit field:

iex> Stripe.PaymentMethod.retrieve("pm_1LHHg4LbyeJtr2S7BRfSddnr")
{:ok,
 %Stripe.PaymentMethod{
   acss_debit: %{
     bank_name: "STRIPE TEST BANK",
     fingerprint: "22KHkQTs0hGFjFCw",
     institution_number: "000",
     last4: "6789",
     transit_number: "11000"
   },
   au_becs_debit: nil,
   bacs_debit: nil,
   billing_details: %{...},
   card: nil,
   created: 1656811968,
   customer: "cus_KKy0ZBqhtEbzGT",
   id: "pm_1LHHg4LbyeJtr2S7BRfSddnr",
   link: nil,
   livemode: false,
   metadata: %{},
   object: "payment_method",
   sepa_debit: nil,
   type: "acss_debit",
   us_bank_account: nil
 }}

And retreiving a bacs_debit payment type should now populate its bacs_debit field:

iex> Stripe.PaymentMethod.retrieve("pm_1JxiLYLbyeJp3tS7S6m9FXa0")
{:ok,
 %Stripe.PaymentMethod{
   acss_debit: nil,
   au_becs_debit: nil,
   bacs_debit: %{
     fingerprint: "3id8WkuR8aycGzht",
     last4: "2345",
     sort_code: "108800"
   },
   billing_details: %{...},
   card: nil,
   created: 1637371588,
   customer: "cus_KKy0ZBqhtEbzGT",
   id: "pm_1JxiLYLbyeJp3tS7S6m9FXa0",
   link: nil,
   livemode: false,
   metadata: %{},
   object: "payment_method",
   sepa_debit: nil,
   type: "bacs_debit",
   us_bank_account: nil
 }}