Port ThirdPartyData / IThirdPartyDataForSpecificFirstParty to the new IPC serialization format.
Pull request: https://github.com/WebKit/WebKit/pull/20050
Committed 270310@main (1a06a71f9057): <https://commits.webkit.org/270310@main> Reviewed commits have been landed. Closing PR #20050 and removing active labels.
<rdar://problem/118037298>