Rewrite hidden API list generation in Python

Generating hidden API lists has grown in complexity and the original
Makefile rule has become a bottleneck for build times. Rewrite the
logic in Python.

Bug: 113278235
Bug: 73736106
Test: frameworks/base/tools/hiddenapi/generate_hiddenapi_lists_test.py
Change-Id: I63f03133d70260d06c55f482b844a4980dc6f734