[thread] add initial ThreadNetwork apex build files

FR: b/235016403
Bug: 257371610
Change-Id: If5ebeb0be7063f813b392c1c01dbf0dc834618e5
8 files changed
tree: e6f1c6f0b65b56f2667a79cd906da2c4679af477
  1. apex/
  2. OWNERS