Add various type reflection interfaces for cppyy/numba

[aaronj0]

Revived #534.
This was earlier motivated by arg match scoring interfaces for numba, and recently a ROOT commit aliasing size() to __len__ for container-like classes: root-project/root@cccbacc, so I opened a fresh PR and also addressed the last comment on making signedness an out parameter

[codecov]

Codecov Report

❌ Patch coverage is 88.57143% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.23%. Comparing base (a727d4f) to head (146715e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/CppInterOp/CppInterOp.cpp	88.57%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #913      +/-   ##
==========================================
+ Coverage   81.18%   81.23%   +0.05%     
==========================================
  Files          13       13              
  Lines        4931     4966      +35     
==========================================
+ Hits         4003     4034      +31     
- Misses        928      932       +4     

Files with missing lines	Coverage Δ
include/CppInterOp/CppInterOp.h	95.55% <ø> (ø)
lib/CppInterOp/CppInterOp.cpp	88.55% <88.57%> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
include/CppInterOp/CppInterOp.h	95.55% <ø> (ø)
lib/CppInterOp/CppInterOp.cpp	88.55% <88.57%> (+<0.01%)	⬆️

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[aaronj0]

Seeing we now have RemoveTypeQualifier I will drop the implementation of GetUnqualifiedType as it is no longer required. However I have extended it with an All enum so that would mimic a call to GetUnqualifiedType instead of making a verbose call on the client-side like Cpp::RemoveTypeQualifier(a, Cpp::QualKind::Const | Cpp::QualKind::Volatile |Cpp::QualKind::Restrict )

[github-actions]

clang-tidy made some suggestions

[github-actions]

warning: use nullptr [modernize-use-nullptr]

Suggested change

	EXPECT_FALSE(Cpp::IsFloatingType(0));
	EXPECT_FALSE(Cpp::IsFloatingType(nullptr));

[vgvassilev]

LGTM!