Implement Manifest template support for targets with packageName attribute

[stepango]

Right now packageName we define in build config and package in the manifest is just duplicated.
So what we need is create a universal manifest file, smth like:

<?xml version="1.0" encoding="utf-8"?>
<manifest package="${packageName}"/>

And make sure the generation of this file is automated for every new target, or even better - use a symlink(or some other approach) to a single file for all targets which need manifest. So having AndroidManisest in every target will become obsolete

We can figure out manifest extensions for Activities later. (Like merge universal template with additional provided manifest file)

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[stepango]

Already implemented via new AGP API's