Add to_dict methods #2037

Job	Run time
cpp_build (ubuntu-latest)	1m 20s
cpp_build (windows-latest)	1m 45s
py_build_test (ubuntu-latest, 3.7)	44s
py_build_test (ubuntu-latest, 3.8)	44s
cpp_build (macos-latest)	3m 48s
py_build_test (ubuntu-latest, 3.9)	40s
py_build_test (ubuntu-latest, 3.10)	38s
py_build_test (ubuntu-latest, 3.11)	36s
py_build_test (ubuntu-latest, 3.12)	38s
py_build_test (windows-latest, 3.7)	40s
py_build_test (windows-latest, 3.8)	48s
py_build_test (windows-latest, 3.9)	38s
py_build_test (windows-latest, 3.10)	49s
py_build_test (windows-latest, 3.11)	40s
py_build_test (windows-latest, 3.12)	41s
py_build_test (macos-latest, 3.7)	54s
py_build_test (macos-latest, 3.8)	54s
py_build_test (macos-latest, 3.9)	54s
py_build_test (macos-latest, 3.10)	55s
py_build_test (macos-latest, 3.11)	55s
py_build_test (macos-latest, 3.12)	56s
py_build_test (windows-latest, mingw64, msys2)	40s
package_sdist	0s
package_wheels	0s
	21m 17s

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