normalize_path: Add `Append` mode #1139

Job	Run time
check-docs	41s
cargo-hack	1m 16s
cargo-public-api-crates	1m 0s
check	42s
cargo-deny check (advisories)	21s
cargo-deny check (bans licenses sources)	23s
test-msrv	2m 36s
style	5s
test-versions (stable)	1m 2s
test-versions (beta)	1m 9s
test-versions (nightly)	1m 8s
	10m 23s

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