Rename ApexInfo.package{Name,Path} to module{Name,Path}

This should resolve the confusion between internal name of APEXes that
comes from apex_manifest.json and packageName that comes from
AndroidManifest.xml.

Follow-up CLs:
* Rename package to module for all apexservice binder APIs.
* Rename package to module in apexd codebase.

Test: atest apexservice_test
Test: atest CtsStagedInstallHostTestCases
Bug: 132428457
Change-Id: If0bd3d368c7373ab0028211a8a4246a9821893af