Add Doctest / Change Project import

[takesei]

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

What

• Add Doctest environment, compatible with old test env.
• Change file name, add _ to every file to remove from python completion.
• You can now import core library directly (like import tagupy.generator)

[codecov-commenter]

Codecov Report

Merging #13 (0a22874) into main (ffbd9da) will increase coverage by 2.98%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   87.14%   90.12%   +2.98%     
==========================================
  Files           9       15       +6     
  Lines          70       81      +11     
==========================================
+ Hits           61       73      +12     
+ Misses          9        8       -1     

Impacted Files	Coverage Δ
tagupy/core/generator/_abs_generator.py	80.00% <ø> (ø)
tagupy/simulator/_abs_simulator.py	81.81% <ø> (ø)
tagupy/type/_analysis_result.py	100.00% <ø> (ø)
tagupy/__init__.py	100.00% <100.00%> (ø)
tagupy/core/analyzer/__init__.py	100.00% <100.00%> (ø)
tagupy/core/analyzer/_abs_analyzer.py	81.81% <100.00%> (ø)
tagupy/core/generator/__init__.py	100.00% <100.00%> (ø)
tagupy/core/report/__init__.py	100.00% <100.00%> (ø)
tagupy/core/report/_abs_report.py	80.00% <100.00%> (ø)
tagupy/manager/__init__.py	100.00% <100.00%> (ø)
... and 11 more

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[taka-sho]