Add helper method to get source range for TokenOrSyntax #1539

Job	Run time
bindings	17m 42s
conan	6m 25s
build (clang-sanitize, ubuntu-22.04)	33m 13s
build (gcc-release, ubuntu-22.04)	7m 53s
build (gcc-11-release, ubuntu-22.04)	7m 28s
linux-coverage	12m 3s
build (gcc-debug-shared, ubuntu-22.04)	6m 31s
build (gcc-debug-noexcept, ubuntu-22.04)	8m 50s
build (macos-release, macos-13)	5m 14s
build (win64-release, windows-latest)	10m 19s
build (win64-debug-shared, windows-latest)	8m 0s
build (win64-debug-noexcept, windows-latest)	6m 59s
	2h 10m 37s

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