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pkg: use OpamFilename.raw to avoid stat calls (#10562)

* pkg: use OpamFilename.raw to avoid stat calls

`OpamFilename.of_string` performs a normalization step which is costly
in terms of syscalls. These are the before/after numbers:

Before:

        seconds     calls    errors syscall
    ----------- --------- --------- ----------------
       0.027816     74367     56793 newfstatat
       0.019369     56769     56768 readlink

After:

        seconds     calls    errors syscall
    ----------- --------- --------- ----------------
       0.016306     38887     28409 newfstatat
       0.010657     28385     28384 readlink

The leftover ones are within the opam libraries and will be addressed
separately.

Signed-off-by: Etienne Millon <me@emillon.org>

* Use an absolute path

Signed-off-by: Etienne Millon <me@emillon.org>

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Signed-off-by: Etienne Millon <me@emillon.org>

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