WL#4978: Backport DTrace probes from 6.0 to 5.4

Backport of 6.0 DTrace probes from 6.0 to 5.4.
In MySQL 5.4.0

For details, see the 6.0 task: WL#4541

This work includes probes at start and end of things like:
   1. Query execution
   2. Command execution
   3. Query start/stop
   4. Query Parser execution
   5. SELECT command execution
   6. DELETE command execution
   7. UPDATE command execution
   8. MULTI UPDATE command execution
   9. MULTI DELETE command execution
  10. INSERT .. SELECT command execution
  11. update_row in handler interface
  12. delete_row in handler interface
  13. write_row in handler interface
  14. lock/unlock external locks in handler interface
  15. network read/write
  16. Connection start/stop
  17. Query cache hit/miss
  18. Filesort start/stop
  19. MyISAM keycache read start/read block/hit/miss/read done/write start/write
block/write done 

For details, see the 6.0 task: WL#4541