[Feat/utils] Add validation functions for assertions

[takesei]

• TaguPy version:
• Python version:
• Operating System:

What

• Add the following validation functions
  • is_positive_int
  • is_positive_int_list
• Refactor current generators test with those functions

Why

In the current code, the same assertion codes appear multiple times, and this is not good.

[codecov-commenter]

Codecov Report

Merging #18 (bc6f45a) into main (deeeb75) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #18   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        13    +1     
  Lines           70        81   +11     
=========================================
+ Hits            70        81   +11     

Impacted Files	Coverage Δ
tagupy/design/generator/_fullfact.py	100.00% <100.00%> (ø)
tagupy/design/generator/_onehot.py	100.00% <100.00%> (ø)
tagupy/utils/__init__.py	100.00% <100.00%> (ø)
tagupy/utils/_validators.py	100.00% <100.00%> (ø)

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