Fix mypy typing errors in pytorch_lightning/trainer/trainer.py

[Jungwon-Lee]

What does this PR do?

Part of https://github.com/Lightning-AI/lightning/issues/13445.

Fix typing errors in pytorch_lightning/trainer/trainer.py

Does your PR introduce any breaking changes? If yes, please list them.

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[Borda]

@BongYang, great work; mind checking the collisions? :rabbit:

[Jungwon-Lee]

@BongYang, great work; mind checking the collisions? 🐰

@Borda Done

but there is import error for get_len how can I solve this?

[otaj]

Hi @BongYang, the issue was with circular imports. I took the liberty to resolve the import errors for you :zap:

[codecov[bot]]

Codecov Report

Merging #14204 (e187be6) into master (021c2f1) will increase coverage by 1%. The diff coverage is 98%.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #14204     +/-   ##
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+ Coverage      83%      84%     +1%     
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  Files         395      276    -119     
  Lines       28814    21108   -7706     
=========================================
- Hits        23884    17757   -6127     
+ Misses       4930     3351   -1579