Re: [w3c/payment-handler] Just-in-time payment handler install (#240)

FYI, @mhahmadi suggests to place the payment handler installer URL in the payment method manifest, which would reduce the number of `Link` headers we're adding to HTTP. This does indeed sound more elegant.

 * HTTP Link header already exists:

```
Link </payments/payment-method-manifest.json>; rel="payment-method-manifest"
```

 * Add `"default_payment_handler_installer_page"` field to the payment method manifest:

```json
{
  "default_payment_handler_installer_page": "/payments/just-in-time-install.html",
  "default_applications": ["https://bobpay.xyz/pay/app1.json"],
  "supported_origins": ["https://partner1.com", "https://partner2.com"]
}
```

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