refactor(api): remove tf.Push and attach NewTask, NewCondition, NewSu…

[noneback]

…bflow with flow

[codecov]

Codecov Report

Attention: Patch coverage is 67.34694% with 16 lines in your changes missing coverage. Please review.

Project coverage is 89.85%. Comparing base (bc8f6d8) to head (25a5b22).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
flow.go	40.00%	12 Missing ⚠️
utils/utils.go	50.00%	2 Missing and 1 partial ⚠️
taskflow.go	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   91.95%   89.85%   -2.11%     
==========================================
  Files          12       12              
  Lines         597      631      +34     
==========================================
+ Hits          549      567      +18     
- Misses         34       49      +15     
- Partials       14       15       +1     

Flag	Coverage Δ
unittests	89.85% <67.34%> (-2.11%)	⬇️

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