weak_ptr: Make it possible to convert to "compatible" pointers #1

Job	Run time
Tests (clang++-18, C++20, dev, )	17m 49s
Tests (clang++-18, C++20, debug, )	16m 21s
Tests (clang++-18, C++20, release, )	17m 6s
Tests (clang++-18, C++23, dev, )	18m 0s
Tests (clang++-18, C++23, debug, --enable-cxx-modules)	13m 41s
Tests (clang++-18, C++23, release, --enable-dpdk)	1m 48s
Tests (gcc-13, C++20, dev, )	12m 38s
Tests (gcc-13, C++20, debug, )	19m 40s
Tests (gcc-13, C++20, release, )	17m 36s
Tests (gcc-13, C++23, dev, )	12m 37s
Tests (gcc-13, C++23, debug, )	19m 30s
Tests (gcc-13, C++23, release, )	18m 2s
	3h 4m 48s

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