GD-Logging: Add INIT flags to configure debug logging

* Three flags:
 - INIT_logging_debug_enabled_for_all
 - INIT_logging_debug_enabled_for_tags
 - INIT_logging_debug_disabled_for_tags
* If a tag is explicitly disabled or enabled, we will follow that
  setting. Otherwise, we check the global enable flag
* This setup allows us to enable/disable individual tags as well as
  enable or disable debug logging for all tags
* This affects only DEBUG and VERBOSE level logs

Bug: 170163727
Test: atest bluetooth_test_gd
Tag: #gd-refactor
Change-Id: Idb99ef1ca0a2d14c73069fcba396ac76a61ee39d