Path handling (#28402)

Consolidate Spack's internal filepath logic to a select
few places and refactor to consistent internal useage of
os.path utilities. Creates a prefix, and a series of utilities
in the path utility module that facilitate handling paths
in a platform agnostic manner.

Convert Windows paths to posix paths internally

Prefer posixpath.join instead of os.path.join

Updated util/ directory to account for Windows integration

Co-authored-by: Stephen Crowell <stephen.crowell@khq.kitware.com>
Co-authored-by: John Parent <john.parent@kitware.com>

Module template format for windows (#23041)

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