Eliminate the naming differences of model names and field names by the OS

[koxudaxi]

Resolve the differences in file loading caused by different operating systems, ensuring that files are loaded in the same order regardless of the OS, and making model names and field names idempotent.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e9b6edf) 100.00% compared to head (4d3708e) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #1348     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           11        26     +15     
  Lines         1020      3332   +2312     
  Branches       201       791    +590     
===========================================
+ Hits          1020      3332   +2312     

Flag	Coverage Δ
unittests	99.93% <99.92%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datamodel_code_generator/__init__.py	100.00% <100.00%> (ø)
datamodel_code_generator/__main__.py	100.00% <100.00%> (ø)
datamodel_code_generator/format.py	100.00% <100.00%> (ø)
datamodel_code_generator/http.py	100.00% <100.00%> (ø)
datamodel_code_generator/imports.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/__init__.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/base.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/dataclass.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/enum.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/improts.py	100.00% <100.00%> (ø)
... and 16 more

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