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

@romandev, in case of multiple payment methods, each one can have an install prompt in the payment sheet. This would not be a popup, but would be in place of the payment app selection. Here's an ASCII mock up:

```
_________________________________________________________________________
| Total:                                                      USD $1.00 |
|_______________________________________________________________________|
| Payment method:                                                       |
| Install payment app from https://bobpay.xyz/pay?   [ ALLOW ] [ DENY ] |
| Install payment app from https://hellopay.xyz/pay? [ ALLOW ] [ DENY ] |
|_______________________________________________________________________|
|                                                    [ PAY ] [ CANCEL ] |
|_______________________________________________________________________|
```


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