Improve template instantiation for cppyy

[aaronj0]

Required for compiler-research/cppyy-backend#104

[github-actions]

clang-tidy made some suggestions

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.78%. Comparing base (12e6e69) to head (3b4ba89).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/Interpreter/CppInterOp.cpp	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   73.71%   73.78%   +0.06%     
==========================================
  Files           8        8              
  Lines        3021     3029       +8     
==========================================
+ Hits         2227     2235       +8     
  Misses        794      794              

Files with missing lines	Coverage Δ
lib/Interpreter/CppInterOp.cpp	79.66% <88.88%> (+0.09%)	⬆️

Files with missing lines	Coverage Δ
lib/Interpreter/CppInterOp.cpp	79.66% <88.88%> (+0.09%)	⬆️