Implement the functions to parse zip64 structs

Implement the logic to parse zip64 eocd and zip64 extended info
in the extra field. Also add unit tests and python tests which
create packages larger than 4GiB.

The extraction of zip entry size > 4GiB will be supported in the follow
ups.

Bug: 150900468
Test: unit tests pass
Change-Id: I4cd9ebbd9709b3d2f9cd293625d2c79024bb45a5