*: Refactor task type system

[Xuanwo]

No description provided.

[codecov]

Codecov Report

Merging #151 into master will decrease coverage by 16.4%.
The diff coverage is 1.73%.

@@             Coverage Diff             @@
##           master     #151       +/-   ##
===========================================
- Coverage   28.98%   12.57%   -16.41%     
===========================================
  Files          16       16               
  Lines         942     1392      +450     
===========================================
- Hits          273      175       -98     
- Misses        658     1209      +551     
+ Partials       11        8        -3

Impacted Files	Coverage Δ
task/generated.go	6.51% <ø> (-23.04%)	⬇️
task/segment.go	0% <ø> (ø)	⬆️
task/list.go	0% <0%> (ø)	⬆️
task/copy.go	0% <0%> (-25.54%)	⬇️
task/iterate.go	0% <0%> (ø)	⬆️
task/delete.go	0% <0%> (ø)	⬆️
utils/task.go	34.5% <25%> (-0.57%)	⬇️

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