Consider enabling misc-include-cleaner

[schwehr]

Feature description

https://clang.llvm.org/extra/clang-tidy/checks/misc/include-cleaner.html

e.g. with frmts/vrt/pixelfunctions.cpp

 std::unique_ptr<gdal::MathExpression> poExpression;

gives:

no header providing "std::unique_ptr" is directly included

Additional context

This is more important for the headers than for the cpp files. A part of self-contained headers is required for pre-compiled headers and can decrease build times for large projects that depend on GDAL.

I would expect it to take a while to gradually work up to the point where all of them are fixed.