Read rpm from VESC motor controller #151

Job	Run time
build (--config=clang-format)	4m 22s
build (--config=clang-tidy)	5m 55s
build (--compilation_mode=opt)	4m 0s
buildifier	15s
build-without-terminfo (gcc12)	4m 11s
build-without-terminfo (clang16)	4m 44s
test (gcc12)	3m 57s
test (gcc12, asan)	3m 58s
test (gcc12, tsan)	4m 19s
test (gcc12, ubsan)	3m 46s
test (clang16)	4m 1s
test (clang16, asan)	4m 21s
test (clang16, tsan)	4m 47s
test (clang16, ubsan)	4m 22s
	56m 58s

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