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migrations: Update user-facing commands

Administrator requested to merge ef/expose-migration-operations into main

Created by: efritz

Pulled from #29831. This PR introduces a new set of commands for sg migration as well as the migrator instance:

(cc @caugustus-sourcegraph and @danieldides, although this shouldn't change any of the recent docs unless you were taking full advantage of the CLI surface)

  • up will apply all unapplied migrations for the current schema (same as up -target=0 or the default up command)
  • upto will take an explicit target to apply (may apply multiple migrations if necessary)
  • downto will take an explicit target to revert to (may unapply multiple migrations)
  • undo will revert the "last applied" migration (this definition will change once we allow multiple migration parents)

Discussions about this set of commands (names, behaviors, etc) are welcome!

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