[w3c/3ds] 3DS 2.0 specificities by schema (#1)

CB schema (Carte Bancaire in France) latest communication identify following specificities:

1. Merchant have the opportunity to express a wish according cardholder authentication. Going back to https://raw.githubusercontent.com/lyra-labs/poc-w3c-webpayments/master/sequence-diagram-PRAPI-3DS2-proposal.png, that information should be known when mediator hand-over control payment handler.
2. During AREQ flow, using extension mechanism of 3DS 2.0 protocol, merchant have to indicate the number of article bought.
3. During ARES flow, using extension mechanism of 3DS 2.0 protocol, CB DS will add a risk analysis score in the message.

Should be interesting to identify specificities for other schemas.

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