feat!: introduce an `"anyhow"` compatibility layer feature flag #370

Job	Run time
Check (stable)	14s
Miri	59s
Rustfmt (stable)	6s
Clippy (stable)	21s
Test Suite (stable)	27s
Test Suite (ubuntu-latest)	28s
Test Suite (stable, --no-default-features)	30s
Test Suite	2m 39s
Test Suite (windows-latest)	2m 29s
Test Suite (stable, --features track-caller)	30s
Test Suite (--no-default-features)	2m 46s
Test Suite (macOS-latest)	53s
Test Suite (stable, --features pyo3)	32s
Test Suite (--features track-caller)	3m 15s
Test Suite (--features auto-install)	2m 31s
Test Suite (stable, --features auto-install)	27s
Test Suite (stable, --all-features)	30s
Test Suite (beta)	37s
Test Suite (beta, --no-default-features)	34s
Test Suite (beta, --features track-caller)	39s
Test Suite (beta, --features pyo3)	36s
Test Suite (beta, --features auto-install)	34s
Test Suite (beta, --all-features)	38s
Test Suite (nightly)	46s
Test Suite (nightly, --no-default-features)	42s
Test Suite (nightly, --features track-caller)	42s
Test Suite (nightly, --features pyo3)	47s
Test Suite (nightly, --features auto-install)	42s
Test Suite (nightly, --all-features)	45s
	27m 39s

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