Isolate Orbax v0 emergency checkpointing. - #4382
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This change moves the Orbax v0 emergency and replicator checkpoint manager implementations, along with their helper functions, into a new file `emergency_checkpointing.py`. This allows the main `checkpointing.py` to focus on Orbax v1, while still providing backward compatibility for the v0 emergency managers through aliases and dispatch functions. PiperOrigin-RevId: 952439143
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Isolate Orbax v0 emergency checkpointing.
This change moves the Orbax v0 emergency and replicator checkpoint manager implementations, along with their helper functions, into a new file
emergency_checkpointing.py. This allows the maincheckpointing.pyto focus on Orbax v1, while still providing backward compatibility for the v0 emergency managers through aliases and dispatch functions.