Prototype of recording installed files

This also installs makefile based build system via DESTDIR into a temporary directory and then merges it into the filesystem.

Fixes #364 (closed)

TODO:

• use typesafe wrappers for recursive deletion, such as mkStaticSubdir :: FilePath -> Path "ghcup"
• test behavior on deletion failure (should we remove the DB file?)
• fix darwin aarch64
• update ghcup-metadata to new bindists
• consider moving TMPDIR to ~/.ghcup/tmp or so and do moveFile during file-merge (is that guaranteed to work with XDG spec?)
• make sure to not change mtime when merging files (otherwise ghc-pkg recache will have to be re-run)
• make sure windows symlinks behave correctly
• test windows failure modes