[AWARE] Add a group network specifier allowing matches to multiple requests

Add a group Aware network specifier which can match any of the
requests it contains. It is intended to represent a single connection
which may match multiple network requests.

Bug: 64125969
Test: unit tests
Test: acts/sl4a + new DataPathTest:test_multiple_identical_networks
Change-Id: I5971dc21c0a6d95fbd287ba0df0c7fba4ba580da