Migrate ghc-pkg to use OsPath

Hannes Siebenhandlrequested to merge
wip/fendor/ghc-pkg-ospath into master

Closes #26960 (closed)

The idea is to migrate ghc-pkg to use OsPath and file-io which use UNC paths correctly.

As a minor plus, the memory usage will be a tiny bit better due to OsPath :)
Similarly to GHC, we still throw errors when OsPath can't be encoded/decoded. I think this is not worse than the status-quo.

Edited by Hannes Siebenhandl

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