More bcachefs updates for 6.7-rc1

 - assorted prep work for disk space accounting rewrite
 - BTREE_TRIGGER_ATOMIC: after combining our trigger callbacks, this
   makes our trigger context more explicit
 - A few fixes to avoid excessive transaction restarts on multithreaded
   workloads: fstests (in addition to ktest tests) are now checking
   slowpath counters, and that's shaking out a few bugs
 - Assorted tracepoint improvements
 - Starting to break up bcachefs_format.h and move on disk types so
   they're with the code they belong to; this will make room to start
   documenting the on disk format better.
 - A few minor fixes
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