gh-98098: Create packages from zipfile and test_zipfile (gh-98103)

* gh-98098: Move zipfile into a package.

* Moved test_zipfile to a package

* Extracted module for test_path.

* Add blurb

* Add jaraco as owner of zipfile.Path.

* Synchronize with minor changes found at jaraco/zipp@d9e7f4352d.

Author: jaraco

.github/CODEOWNERS

@@ -154,3 +154,6 @@ Lib/ast.py                    @isidentical
 
 # pathlib
 **/*pathlib*                  @brettcannon
+
+# zipfile.Path
+**/*zipfile/*_path.py         @jaraco

Lib/test/test_zipfile/__init__.py

@@ -0,0 +1,5 @@
+import os
+from test.support import load_package_tests
+
+def load_tests(*args):
+    return load_package_tests(os.path.dirname(__file__), *args)