Generate Serialization for MonotonicObjectIdentifier
rdar://121948853
Pull request: https://github.com/WebKit/WebKit/pull/23530
Pull request: https://github.com/WebKit/WebKit/pull/23599
Pull request: https://github.com/WebKit/WebKit/pull/23603
Committed 273939@main (eebc7b5ed87f): <https://commits.webkit.org/273939@main> Reviewed commits have been landed. Closing PR #23603 and removing active labels.