Generate serialization for WebCore::Payment, WebCore::PaymentContact, and WebCore::PaymentMerchantSession
<rdar://problem/121195605>
Pull request: https://github.com/WebKit/WebKit/pull/22916
Committed 273512@main (2a16c10dc012): <https://commits.webkit.org/273512@main> Reviewed commits have been landed. Closing PR #22916 and removing active labels.