Work on generic support

[Thrameos]

This is a draft PR which adds support for representing Generics in JPype.

In the PR we make is so that Java class with generics according to reflection can be used like

JA = java.util.ArrayList
JAS = java.util.ArrayList[java.lang.String]
JAS@['yes','no'] # works
JAS@['yes', 1'] # fails 1 is not castable to string.

The intent is to make is so when converting to the generic type the arguments will be checked.

Currently this PR just adds the types to the class. We need to update the converters to make use of them.

[codecov]

Codecov Report

❌ Patch coverage is 25.42373% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.77%. Comparing base (aa31348) to head (796556f).
⚠️ Report is 1026 commits behind head on master.

Files with missing lines	Patch %	Lines
native/python/pyjp_class.cpp	20.00%	36 Missing and 4 partials ⚠️
native/common/include/jp_class.h	0.00%	2 Missing ⚠️
native/common/include/jp_modifier.h	0.00%	2 Missing ⚠️

❌ Your project check has failed because the head coverage (68.50%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #835      +/-   ##
============================================
- Coverage     83.06%   82.77%   -0.30%     
- Complexity      442      443       +1     
============================================
  Files           142      142              
  Lines         11822    11875      +53     
  Branches       4462     4496      +34     
============================================
+ Hits           9820     9829       +9     
- Misses         1249     1289      +40     
- Partials        753      757       +4     

Files with missing lines	Coverage Δ
native/java/org/jpype/manager/ModifierCode.java	100.00% <100.00%> (ø)
native/java/org/jpype/manager/TypeManager.java	90.32% <100.00%> (+0.04%)	⬆️
native/python/include/pyjp.h	100.00% <ø> (ø)
native/python/pyjp_module.cpp	83.09% <100.00%> (+0.09%)	⬆️
native/common/include/jp_class.h	93.33% <0.00%> (-6.67%)	⬇️
native/common/include/jp_modifier.h	87.50% <0.00%> (-5.84%)	⬇️
native/python/pyjp_class.cpp	80.23% <20.00%> (-4.98%)	⬇️

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[Thrameos]

This will be revisited post 1.6.