Convert undo.h to new serialization framework

Summary:
This is a partial backport of Core PR18021 [4/4]
https://github.com/bitcoin/bitcoin/pull/18021/commits/3c94b0039d2ca2a8c41fd6127ff5019a2afc304e

Depends on D8744

There are some important differences in the deserialization, due to differences in how the Coin object is implemented (coins.h)

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, majcosta

Reviewed By: #bitcoin_abc, majcosta

Subscribers: majcosta

Differential Revision: https://reviews.bitcoinabc.org/D8745