Updated includes to be runfiles based.

[UebelAndre]

This change introduces support for Windows by avoiding reliance on relative paths and instead looking up include paths via runfiles interfaces to provide a more consistent cross-platform experience. This is the same approach to how rules_python handles import paths.

Changes:

• perl_binary and perl_test now writes a *.bat entrypoint when building for windows.
• Introduced a common entrypoint.pl script that is now responsible for spawning the main entrypoint for Perl binaries.
• PerlInfo.includes will not be a depset of rlocationpath strings.
• Environment variables are handled by RunEnvironmentInfo vs being injected into the shell entrypoint.

This change should be considered a major change.

[UebelAndre]

@skeletonkey this change is now ready for review.

[UebelAndre]

Some additional context. This change is intended to provide support for windows but by default windows systems do not support symlinks which limits them to RUNFILES_MANIFEST_FILE interfaces of runfiles. This limitation is what inflated the size of this change.