[w3c/webpayments-methods-tokenization] Drop the word 'card' from this payment method (#27)

As discussed at the F2F I don't see the value in calling this tokenized **card**.

Physical cards are a legacy that will soon disappear from online payments. My hope is that this payment method will be around MUCH longer and will continue to be used even when the token is generated by a digital wallet that has no concept of a "card".

Concretely I propose:

1. The payment method identifier should be: `token`
2. Change `TokenizedCardRequest` to `TokenRequest`
3. Change `TokenizedCardResponse` to `TokenResponse`
4. Change `cardholderName` to `payerName`
5. Change `lastFourOfFPAN` to `paymentInstrumentLabel`
6. Change `card` to `payment instrument` or `account` in flow diagram.

I am happy to submit a PR if there is agreement on this proposal.


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