[plugin] a workaround for zero plugins' optimizer checkpoint

[ver217]

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Closes #3776

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1. Update low level zero and gemini plugin. Saves optimizer checkpoint on each process with different name.
2. Add warning info.
3. Update unit test.

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[github-actions]

The code coverage for the changed files is 96%.

Click me to view the complete report

Name                                                            Stmts   Miss  Cover
-----------------------------------------------------------------------------------
colossalai/booster/plugin/gemini_plugin.py                        106      9    92%
colossalai/booster/plugin/low_level_zero_plugin.py                 85      6    93%
tests/test_checkpoint_io/test_gemini_checkpoint_io.py              80      0   100%
tests/test_checkpoint_io/test_low_level_zero_checkpoint_io.py      46      0   100%
tests/test_checkpoint_io/test_torch_ddp_checkpoint_io.py           56      0   100%
tests/test_checkpoint_io/utils.py                                  14      0   100%
-----------------------------------------------------------------------------------
TOTAL                                                             387     15    96%