log: add orphanage logs, add TXPACKAGES category
Summary:
- Additional orphan-related logging to make testing and debugging easier. - Add TXPACKAGES category for logging. - Move a nearby comment block that was in the wrong place.
Backport of core#28364.
Test Plan:
ninja all check-all
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Differential Revision: https://reviews.bitcoinabc.org/D16318