[lazy] refactor lazy init

[ver217]

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1. Remove old useless lazy init context
2. Move latest lazy init code to colossalai/lazy
3. Update unit tests
4. Fix deepcopy of lazy tensor

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[github-actions]

The code coverage for the changed files is 85%.

Click me to view the complete report

Name                                                   Stmts   Miss  Cover
--------------------------------------------------------------------------
colossalai/lazy/__init__.py                                2      0   100%
colossalai/lazy/lazy_init.py                             298     40    87%
colossalai/zero/gemini/gemini_ddp.py                     400     67    83%
tests/test_booster/test_plugin/test_gemini_plugin.py      74     10    86%
tests/test_lazy/lazy_init_utils.py                        68     14    79%
tests/test_lazy/test_distribute.py                        74      3    96%
tests/test_lazy/test_models.py                            13      1    92%
--------------------------------------------------------------------------
TOTAL                                                    929    135    85%