feat: add requirements.txt to manage python dependency

[namwoam]

Because

• There are many components that requires specific python packages

This commit

• Make pipeline-backend to install python dependency with a unified requirements.txt file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 4.98%. Comparing base (335b109) to head (39ebf91).
Report is 30 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #591      +/-   ##
========================================
+ Coverage   4.58%   4.98%   +0.40%     
========================================
  Files         81      84       +3     
  Lines      30953   33694    +2741     
========================================
+ Hits        1418    1681     +263     
- Misses     29276   31722    +2446     
- Partials     259     291      +32     

Flag	Coverage Δ
unittests	4.98% <ø> (+0.40%)	⬆️

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