ART: Add Heap JVMTI extension API

Add extension API for Android heaps. Add a function that returns
the heap id for a tag (implying an object). Add a function that
returns the heap name for a given heap id.

Add tests.

(cherry picked from commit d73aba4f)

Bug: 37283268
Test: m test-art-host
Test: art/test/testrunner/testrunner.py -b --host -t 913
Test: cts-tradefed run cts-dev --module CtsJvmtiRunTest913HostTestCases
Change-Id: I3a140ce00a33507c9ac3263d0badd10f3daf558c