feature: add `ReplacingReader` #2033

Job	Run time
rustfmt	14s
test (pinned, ubuntu-latest, 1.60.0)	2m 3s
test (stable, ubuntu-latest, stable)	49s
test (stable-x86, ubuntu-latest, stable, i686-unknown-linux-gnu)	50s
test (stable-aarch64, ubuntu-latest, stable, aarch64-unknown-linux-gnu)	3m 49s
test (stable-powerpc64, ubuntu-latest, stable, powerpc64-unknown-linux-gnu)	2m 11s
test (stable-s390x, ubuntu-latest, stable, s390x-unknown-linux-gnu)	2m 36s
test (beta, ubuntu-latest, beta)	38s
test (nightly, ubuntu-latest, nightly)	37s
test (macos, macos-latest, stable)	46s
test (win-msvc, windows-latest, stable)	1m 16s
test (win-gnu, windows-latest, stable-x86_64-gnu)	1m 34s
	17m 23s

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