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feat(Apple Pay): validate and support more ApplePayPaymentRequest features

When Recurly supports more of the supported networks, ensure that the
client will only query those that are supported by their browser to
avoid any potential errors.

This also adds support to pass in an `ApplePayLineItem` into the
`options.total` since the current options limit just the properties of
the total line item to just the `label` and `total`. Note that using
this interface will ignore `options.label`.

`options.label` is deprecated and optional in favor of the above. If not
supplied with a dollar amount in `options.total`, the new
`options.i18n.totalLineItemLabel` will be used, which is defaulted to "Total".

Added support for passing in an array of `ApplePayLineItem`'s via
`option.lineItems`. This and the `total` are still overridden by
the presence `options.pricing`.

Removes the payment request properties from the `ApplePay#config` property
in favor of storing the full request in the psuedo-private `_applePayPaymentRequest`
property.

Adds the boolean option `enforceVersion`, which will raise an
`apple-pay-not-supported` error if the client does not support the
minimum version for certain features, like `requiredShippingContactFields`.

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