Significantly speed up applying GTFS-RT updates #572

Job	Run time
formatting	49s
macos (macos-x86_64, On)	9m 45s
macos (macos-arm64)	18m 17s
linux (linux-amd64-release, linux-amd64)	1m 27s
msvc (Debug)	3m 25s
linux (linux-x86-release, linux-x86)	1m 25s
msvc (Release)	2m 41s
linux (linux-arm-release, linux-arm, qemu-arm-static)	1m 30s
linux (linux-arm64-release, linux-arm64, qemu-aarch64-static)	1m 30s
linux (clang-tidy)	3m 49s
linux (linux-sanitizer)	1m 31s
linux (linux-debug, valgrind --leak-check=full --error-exitcode=1)	1m 19s
	47m 28s

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