feat!: introduce an `"anyhow"` compatibility layer feature flag #354

Job	Run time
Rustfmt (stable)	6s
Clippy (stable)	25s
Check (stable)	14s
Miri	1m 7s
Test Suite (stable)	30s
Test Suite (ubuntu-latest)	33s
Test Suite (stable, --no-default-features)	30s
Test Suite	1m 43s
Test Suite (windows-latest)	1m 55s
Test Suite (stable, --features track-caller)	37s
Test Suite (macOS-latest)	1m 27s
Test Suite (stable, --features pyo3)	31s
Test Suite (--no-default-features)	1m 36s
Test Suite (stable, --features auto-install)	35s
Test Suite (--features track-caller)	1m 38s
Test Suite (stable, --all-features)	33s
Test Suite (--features auto-install)	1m 35s
Test Suite (beta)	38s
Test Suite (beta, --no-default-features)	35s
Test Suite (beta, --features track-caller)	35s
Test Suite (beta, --features pyo3)	43s
Test Suite (beta, --features auto-install)	43s
Test Suite (beta, --all-features)	36s
Test Suite (nightly)	45s
Test Suite (nightly, --no-default-features)	47s
Test Suite (nightly, --features track-caller)	46s
Test Suite (nightly, --features pyo3)	47s
Test Suite (nightly, --features auto-install)	45s
Test Suite (nightly, --all-features)	48s
	24m 3s

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