Move OwnedFrozenRef into own module #5984

Job	Run time
Get the latest prelude hash	3s
build (ubuntu-22.04, aarch64-unknown-linux-gnu, true)	9m 43s
build (ubuntu-22.04, aarch64-unknown-linux-musl, true)	9m 48s
build (ubuntu-22.04, x86_64-unknown-linux-gnu)	9m 27s
build (ubuntu-22.04, x86_64-unknown-linux-musl, true)	9m 58s
build (macos-12, aarch64-apple-darwin, true)	13m 55s
build (macos-12, x86_64-apple-darwin)	22m 19s
build (windows-2022, x86_64-pc-windows-msvc, true)	10m 24s
Publish buck2.build	0s
Release `latest` tag	0s
Check if there's a release for this half of the month already	0s
Release bi-monthly tag	0s
	1h 25m 37s

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