[R-package] add a tree plotting function #9351

Job	Run time
r-package (ubuntu-latest, gcc, R 3.6, cmake)	7m 2s
r-package (clang16, R-devel)	8m 25s
r-package (ubuntu-latest, gcc, R 4.3, cmake)	7m 38s
r-package (clang17, R-devel)	8m 36s
r-package (ubuntu-latest, clang, R 4.3, cmake)	7m 26s
r-package (clang18, R-devel)	8m 35s
r-package (macos-13, gcc, R 4.3, cmake)	8m 49s
r-package (clang19, R-devel)	7m 53s
r-package (macos-13, clang, R 4.3, cmake)	8m 7s
r-sanitizers (ubuntu-latest, R-devel, gcc ASAN/UBSAN)	14m 57s
r-package (gcc14, R-devel)	8m 30s
r-package (windows-latest, MINGW, R 3.6, cmake)	7m 54s
r-sanitizers (ubuntu-latest, R-devel, clang ASAN/UBSAN)	28m 42s
r-package (intel, R-devel)	10m 17s
r-package (windows-latest, MINGW, R 4.3, cmake)	11m 26s
r-package (rchk, R-devel)	12m 58s
r-package (windows-2019, MSVC, R 3.6, cmake)	24m 7s
r-package (windows-2022, MSVC, R 4.3, cmake)	25m 37s
r-package (windows-latest, MINGW, R 3.6, cran)	7m 50s
r-package (windows-latest, MINGW, R 4.3, cran)	11m 29s
r-package (ubuntu-latest, gcc, R 4.3, cran)	8m 31s
r-package (macos-13, clang, R 4.3, cran)	8m 38s
r-package (macos-14, clang, R 4.3, cran)	4m 42s
all-r-package-jobs-successful	4s
	4h 18m 13s

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