feat(common): add ut for common tasks and refactor task utils

[liubog2008]

• Add ut for common task
• Add ctx into task v3
• Rename ctx to state in pd tasks
• Add State interface in pd tasks

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.58824% with 148 lines in your changes missing coverage. Please review.

Project coverage is 24.50%. Comparing base (a716b34) to head (96e1ff7).

Additional details and impacted files

@@              Coverage Diff               @@
##           feature/v2    #6010      +/-   ##
==============================================
+ Coverage       23.29%   24.50%   +1.21%     
==============================================
  Files             149      151       +2     
  Lines            9862     9912      +50     
==============================================
+ Hits             2297     2429     +132     
+ Misses           7377     7294      -83     
- Partials          188      189       +1     

Flag	Coverage Δ
unittest	24.50% <45.58%> (+1.21%)	⬆️

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