tool-cache: Support for extracting xar compatible archives (#207)

* Test xar extraction

* Support for extracting xar compatible archives

* Only allow extractXar on mac

* Create xar during test instead of using prebuilt

* Update lockfiles

* Add verbose flag if debug

* Add extractXar example to readme

* Revert "Update lockfiles"

This reverts commit a6cbddccf6.

* Use node pkg in example

* Remove and ignore prebuilt xar

* Tests for non-existing dir and without flags

* Better arguments handling

* Make sure that target directory exists

Co-authored-by: Thomas Boop <52323235+thboop@users.noreply.github.com>

.gitignore

@@ -3,4 +3,5 @@ packages/*/node_modules/
 packages/*/lib/
 packages/*/__tests__/_temp/
 .DS_Store
+*.xar
 packages/*/audit.json