Support converting between `anyhow::Error` and `eyre::Report` automatically with `?` #477

Job	Run time
Check (stable)	13s
Rustfmt (stable)	6s
Clippy (stable)	24s
Miri	48s
Test Suite (stable)	29s
Test Suite	2m 23s
Test Suite (stable, --no-default-features)	7s
Test Suite (ubuntu-latest)	26s
Test Suite (--no-default-features)	2m 27s
Test Suite (stable, --no-default-features --features track-caller)	14s
Test Suite (windows-latest)	26s
Test Suite (--no-default-features --features track-caller)	2m 25s
Test Suite (stable, --no-default-features --features auto-install)	26s
Test Suite (macOS-latest)	31s
Test Suite (--no-default-features --features auto-install)	2m 20s
Test Suite (stable, --features pyo3)	27s
Test Suite (stable, --all-features)	30s
Test Suite (beta)	33s
Test Suite (beta, --no-default-features)	31s
Test Suite (beta, --no-default-features --features track-caller)	34s
Test Suite (beta, --no-default-features --features auto-install)	33s
Test Suite (beta, --features pyo3)	31s
Test Suite (beta, --all-features)	32s
Test Suite (nightly)	31s
Test Suite (nightly, --no-default-features)	31s
Test Suite (nightly, --no-default-features --features track-caller)	30s
Test Suite (nightly, --no-default-features --features auto-install)	30s
Test Suite (nightly, --features pyo3)	32s
Test Suite (nightly, --all-features)	32s
	21m 2s

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