Add support for lvalue assignment patterns #1487

Job	Run time
linux-coverage	26m 12s
bindings	18m 42s
conan	6m 42s
build (clang-sanitize, ubuntu-22.04)	33m 37s
build (gcc-release, ubuntu-22.04)	7m 30s
build (gcc-11-release, ubuntu-22.04)	7m 23s
build (gcc-debug-shared, ubuntu-22.04)	6m 32s
build (gcc-debug-noexcept, ubuntu-22.04)	6m 52s
build (macos-release, macos-13)	6m 10s
build (win64-release, windows-latest)	10m 6s
build (win64-debug-shared, windows-latest)	8m 29s
build (win64-debug-noexcept, windows-latest)	7m 21s
	2h 25m 36s

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