Introduce Sym::to_path() helper method #695

Job	Run time
Test and coverage	3m 8s
Test with address sanitizer	4m 1s
Benchmark	7m 25s
Test with leak sanitizer	3m 4s
Generate documentation	26s
Lint with clippy	1m 7s
Build [ubuntu-latest, 1.63.0, dev, ]	3m 16s
Check generated C header	42s
Build [ubuntu-latest, 1.63.0, release, ]	3m 48s
No-op rebuilds	58s
Build [ubuntu-latest, stable, dev, ]	21s
Build [ubuntu-latest, stable, release, ]	36s
Check code formatting	15s
Test with release build	2m 40s
Build [macos-latest, 1.63.0, dev, ]	4m 57s
Build [macos-latest, 1.63.0, release, ]	4m 10s
Build [macos-latest, stable, dev, ]	1m 2s
Build [macos-latest, stable, release, ]	1m 2s
Build [ubuntu-latest, stable, dev, --no-default-features]	20s
	43m 18s

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