Implement the cellToBoundary command for the h3 binary #1319

Job	Run time
CMake correctness checks	5s
Coverage	3m 34s
Test Compile clang Debug	3m 28s
Test Compile gcc Debug	3m 29s
Test Compile clang Release	2m 37s
Test Valgrind	9m 10s
Test Compile gcc Release	2m 22s
Test Compile clang Debug -fsanitize=undefined,float-divide-by-zero -fno-sanitize-recover=undefined,float-divide-by-zero	6m 2s
Test Compile clang Release -fsanitize=undefined,float-divide-by-zero -fno-sanitize-recover=undefined,float-divide-by-zero	3m 8s
Test Compile clang Debug -fsanitize=memory -fno-sanitize-recover=memory	27m 45s
Test Compile clang Release -fsanitize=memory -fno-sanitize-recover=memory	6m 23s
Test Compile clang Debug -fsanitize=address -fno-sanitize-recover=address	5m 59s
Test Compile clang Release -fsanitize=address -fno-sanitize-recover=address	3m 24s
	1h 17m 26s

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