[checkpointio] Sharded Optimizer Checkpoint for Gemini Plugin

[Fridge003]

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resolved #4035

📝 What does this PR do?

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Implement sharded optimizer checkpointing feature.
For detailed design, please refer to #4140

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• I have added thorough tests.
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[github-actions]

The code coverage for the changed files is 93%.

Click me to view the complete report

Name                                                        Stmts   Miss  Cover
-------------------------------------------------------------------------------
colossalai/booster/plugin/gemini_plugin.py                    162     14    91%
colossalai/zero/gemini/gemini_optimizer.py                    408     38    91%
tests/test_checkpoint_io/test_gemini_checkpoint_io.py          84      0   100%
tests/test_checkpoint_io/test_gemini_torch_compability.py     116      0   100%
-------------------------------------------------------------------------------
TOTAL                                                         770     52    93%

[github-actions]

The code coverage for the changed files is 91%.

Click me to view the complete report

Name                                                        Stmts   Miss  Cover
-------------------------------------------------------------------------------
colossalai/booster/plugin/gemini_plugin.py                    145     14    90%
colossalai/checkpoint_io/general_checkpoint_io.py              92      8    91%
colossalai/checkpoint_io/utils.py                             264     44    83%
colossalai/zero/gemini/gemini_optimizer.py                    406     37    91%
tests/test_checkpoint_io/test_gemini_checkpoint_io.py          84      0   100%
tests/test_checkpoint_io/test_gemini_torch_compability.py     116      0   100%
-------------------------------------------------------------------------------
TOTAL                                                        1107    103    91%