Make `Directory` its own distribution kind #6173

Job	Run time
cargo test \| ubuntu	4m 7s
cargo clippy \| ubuntu	50s
cargo test \| macos	4m 19s
cargo clippy \| windows	2m 48s
cargo fmt	30s
cargo test \| windows	4m 35s
Determine changes	8s
check windows trampoline	4m 22s
build binary \| linux	1m 18s
build binary \| macos aarch64	1m 14s
build binary \| macos x86_64	1m 55s
build binary \| windows	1m 41s
benchmarks	1m 56s
check system \| homebrew python on macos aarch64	17s
check cache \| macos aarch64	12s
check system \| python on macos aarch64	15s
check system \| python on fedora	36s
ecosystem test \| prefecthq/prefect	2m 7s
check cache \| ubuntu	52s
check system \| python on debian	43s
ecosystem test \| pallets/flask	11s
check system \| python on opensuse	52s
check system \| python on rocky linux 8	25s
check system \| python on ubuntu	15s
check system \| alpine	27s
check system \| amazonlinux	28s
check system \| python on rocky linux 9	31s
check system \| python via pyenv	1m 51s
check system \| pypy on ubuntu	26s
check system \| pyston	3m 50s
check system \| python3.10 on windows x86	45s
check system \| python3.13 on windows	1m 18s
check system \| python3.12 via chocolatey	1m 33s
check system \| conda3.8 on linux	42s
check system \| conda3.11 on linux	46s
check system \| embedded python3.10 on windows	25s
check system \| python3.10 on windows	57s
check system \| conda3.8 on windows	1m 51s
check system \| conda3.11 on windows	1m 43s
check system \| conda3.8 on macos	48s
check system \| conda3.11 on macos	44s
check system \| python on macos x86_64	26s
	55m 59s

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