Support converting between `anyhow::Error` and `eyre::Report` automatically with `?` #455

Job	Run time
Test Suite (stable)	6s
Test Suite (stable, --no-default-features)	1s
Check (stable)	12s
Test Suite (stable, --no-default-features --features track-caller)	1s
Test Suite	1m 39s
Test Suite (ubuntu-latest)	27s
Test Suite (stable, --no-default-features --features auto-install)	1s
Test Suite (--no-default-features)	1m 39s
Test Suite (windows-latest)	26s
Test Suite (stable, --features pyo3)	2s
Clippy (stable)	22s
Test Suite (--no-default-features --features track-caller)	1m 39s
Test Suite (macOS-latest)	27s
Test Suite (stable, --all-features)	8s
Test Suite (--no-default-features --features auto-install)	1m 40s
Test Suite (beta)	36s
Test Suite (beta, --no-default-features)	35s
Rustfmt (stable)	9s
Test Suite (beta, --no-default-features --features track-caller)	34s
Miri	48s
Test Suite (beta, --no-default-features --features auto-install)	36s
Test Suite (beta, --features pyo3)	36s
Test Suite (beta, --all-features)	40s
Test Suite (nightly)	34s
Test Suite (nightly, --no-default-features)	6s
Test Suite (nightly, --no-default-features --features track-caller)	22s
Test Suite (nightly, --no-default-features --features auto-install)	20s
Test Suite (nightly, --features pyo3)	24s
Test Suite (nightly, --all-features)	35s
	15m 45s

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