Add optional comment field to Marker #2005

Job	Run time
cpp_build (ubuntu-latest)	1m 45s
cpp_build (windows-latest)	2m 39s
py_build_test (ubuntu-latest, 3.7)	2m 19s
cpp_build (macos-latest)	9m 4s
py_build_test (ubuntu-latest, 3.8)	2m 12s
py_build_test (ubuntu-latest, 3.9)	2m 15s
py_build_test (ubuntu-latest, 3.10)	2m 1s
py_build_test (ubuntu-latest, 3.11)	2m 3s
py_build_test (ubuntu-latest, 3.12)	2m 5s
py_build_test (windows-latest, 3.7)	2m 7s
py_build_test (windows-latest, 3.8)	2m 7s
py_build_test (windows-latest, 3.9)	2m 5s
py_build_test (windows-latest, 3.10)	2m 6s
py_build_test (windows-latest, 3.11)	2m 6s
py_build_test (windows-latest, 3.12)	2m 10s
py_build_test (macos-latest, 3.7)	2m 19s
py_build_test (macos-latest, 3.8)	2m 23s
py_build_test (macos-latest, 3.9)	2m 17s
py_build_test (macos-latest, 3.10)	2m 14s
py_build_test (macos-latest, 3.11)	2m 21s
py_build_test (macos-latest, 3.12)	2m 20s
py_build_test (windows-latest, mingw64, msys2)	2m 7s
package_sdist	0s
package_wheels	0s
	55m 5s

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