Extend ABI to expose journeys, footpaths, cancellations #1066

Job	Run time
formatting	47s
msvc (Debug)	7m 11s
linux (linux-amd64-release, linux-amd64)	2m 10s
msvc (Release)	8m 38s
macos (macos-x86_64, On)	10m 19s
linux (linux-arm64-release, linux-arm64, qemu-aarch64-static)	2m 23s
macos (macos-arm64)	12m 39s
linux (clang-tidy)	6m 25s
linux (linux-sanitizer)	3m 21s
linux (linux-debug, valgrind --leak-check=full --error-exitcode=1)	1m 53s
	55m 46s

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