Provide module support for native-image runtime

[olpaw]

Once #1962 is implemented we can add proper support for making module related information available at image runtime. This includes implementations for

• java.lang.Class#getModule
• Methods of java.lang.Module

that correctly reflect the module relationships that have been present at image build time (under closed world assumption of static analysis).

[olpaw]

@ivan-ristovic's #3445 took care of this (mostly).