Add support for migrate instrument (performance measurement)

I fixed tests here and in the Drupal migrate subsystem. It should be ready to review now.

Patch for 6.0.x

I was trying to reroll the patch the the fork, but failed to do it
attached is the re-roll against the latest 6.0.x

This would be a fantastic feature, so thanks for working on it! I looked for this after I found this Drupal 7 documentation page, recently migrated into the new documentation system, Expand the range of data tracked by the timer instrument during a migration → .

I tried applying the patch from #12 (thanks for re-rolling) against the latest Migrate Tools 6.0.5 release (it does not apply against dev ...) but get this error:

~/dev/drupal$ drush migrate:import mymigration  --instrument
  [error]  Error: Class "Drupal\migrate\Instrument\MigrateInstrument" not found in Drupal\migrate_tools\Drush\Commands\MigrateToolsCommands->import() (line 501 of /var/www/html/web/modules/contrib/migrate_tools/src/Drush/Commands/MigrateToolsCommands.php) #0 [internal function]: Drupal\migrate_tools\Drush\Commands\MigrateToolsCommands->import()

• Drupal 10.4.7
• Drush 13.6
• PHP 8.3.21

Will it be possible to get a top 5 list of modules, which are the biggest bottle necks? Like, we know that Pathauto slows things down, but it would be nice to get a list of module bottle neck number #2, #3, etc. as well.