Read rpm from VESC motor controller #152

Job	Run time
buildifier	14s
test (gcc12)	4m 21s
test (gcc12, asan)	3m 58s
test (gcc12, tsan)	3m 45s
test (gcc12, ubsan)	4m 4s
test (clang16)	4m 32s
test (clang16, asan)	4m 19s
test (clang16, tsan)	4m 38s
test (clang16, ubsan)	4m 49s
build-without-terminfo (gcc12)	3m 40s
build-without-terminfo (clang16)	4m 10s
build (--config=clang-format)	4m 19s
build (--config=clang-tidy)	5m 20s
build (--compilation_mode=opt)	4m 25s
	56m 34s

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