#688: Move utils_instance_or_reference_wrapper.hpp to `solvers_nonlinear` #304

Job	Run time
baseline (fedora-clang-17, Release)	4m 46s
baseline (fedora-clang-17, Debug)	3m 46s
baseline (fedora-gnu-13, Release)	4m 27s
baseline (fedora-gnu-13, Debug)	3m 45s
baseline (ubuntu-clang-14, Release)	4m 42s
baseline (ubuntu-clang-14, Debug)	3m 47s
baseline (ubuntu-gnu-11, Release)	4m 25s
baseline (ubuntu-gnu-11, Debug)	3m 36s
baseline (ubuntu-gnu-11, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	4m 26s
baseline (ubuntu-clang-14, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	5m 7s
baseline (fedora-gnu-13, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	4m 47s
baseline (fedora-clang-17, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	5m 21s
	52m 55s

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