Add feature matrix to README and Symbolizer documentation #712

Job	Run time
No-op rebuilds	1m 9s
Test and coverage	3m 15s
Test with address sanitizer	4m 36s
Build [ubuntu-latest, 1.63.0, dev, ]	3m 15s
Test with leak sanitizer	3m 19s
Build [ubuntu-latest, 1.63.0, release, ]	3m 23s
Benchmark	7m 30s
Check generated C header	50s
Build [ubuntu-latest, stable, dev, ]	30s
Build [ubuntu-latest, stable, release, ]	35s
Lint with clippy	56s
Check code formatting	17s
Build [macos-latest, 1.63.0, dev, ]	4m 13s
Test with release build	2m 32s
Build [macos-latest, 1.63.0, release, ]	3m 45s
Generate documentation	22s
Build [macos-latest, stable, dev, ]	1m 15s
Build [macos-latest, stable, release, ]	1m 2s
Build [ubuntu-latest, stable, dev, --no-default-features]	30s
	43m 14s

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