Add implementation of to_nearest_timecode #2066

Job	Run time
cpp_build (ubuntu-22.04)	1m 57s
cpp_build (windows-2022)	2m 3s
py_build_test (ubuntu-22.04, 3.7)	29s
cpp_build (macos-12)	4m 41s
py_build_test (ubuntu-22.04, 3.8)	28s
py_build_test (ubuntu-22.04, 3.9)	43s
py_build_test (ubuntu-22.04, 3.10)	29s
py_build_test (ubuntu-22.04, 3.11)	29s
py_build_test (ubuntu-22.04, 3.12)	26s
py_build_test (windows-2022, 3.7)	24s
py_build_test (windows-2022, 3.8)	28s
py_build_test (windows-2022, 3.9)	28s
py_build_test (windows-2022, 3.10)	20s
py_build_test (windows-2022, 3.11)	29s
py_build_test (windows-2022, 3.12)	29s
py_build_test (macos-12, 3.7)	30s
py_build_test (macos-12, 3.8)	42s
py_build_test (macos-12, 3.9)	42s
py_build_test (macos-12, 3.10)	42s
py_build_test (macos-12, 3.11)	42s
py_build_test (macos-12, 3.12)	29s
py_build_test (windows-2022, mingw64, msys2)	28s
package_wheels	0s
package_sdist	0s
	18m 38s

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