introduce bufmgr hooks

When Who What
2022-10-12 16:12:48 Nathan Bossart (bossartn) Closed in commitfest 2022-11 with status: Withdrawn
2022-10-12 07:09:17 Michael Paquier (michael-kun) Closed in commitfest 2022-09 with status: Moved to next CF
2022-08-29 22:36:28 Nathan Bossart (bossartn) Changed authors to Nathan Bossart (bossartn)
2022-08-29 22:36:28 Nathan Bossart (bossartn) Changed targetversion to 16
2022-08-29 22:36:18 Nathan Bossart (bossartn) Attached mail thread 20220829222449.GA540837@nathanxps13
2022-08-29 22:36:18 Nathan Bossart (bossartn) Created patch record