Add an example symbolizing a captured backtrace #311

Job	Run time
Check generated C header	1m 19s
Benchmark	7m 38s
Generate documentation	31s
Build [ubuntu-latest, 1.63.0, dev, ]	1m 26s
Build [ubuntu-latest, 1.63.0, release, ]	1m 27s
Build [ubuntu-latest, stable, dev, ]	53s
Build [ubuntu-latest, stable, release, ]	57s
Build [macos-latest, 1.63.0, dev, ]	1m 46s
Build [macos-latest, 1.63.0, release, ]	4m 50s
Build [macos-latest, stable, dev, ]	57s
Build [macos-latest, stable, release, ]	59s
Build [ubuntu-latest, stable, dev, --no-default-features]	24s
Lint with clippy	47s
No-op rebuilds	57s
Check code formatting	23s
Test and coverage	2m 21s
Test with release build	2m 31s
Test with address sanitizer	4m 44s
Test with leak sanitizer	3m 9s
	37m 59s

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