[Terms of Address] New hiden APIs, setSystemGrammaticalGender and getSystemGrammaticalGender

Change-Id: I1b35078cbc5f581b6b13daa8afcb6eee1aa2a15f
Test: adb shell device_config put grammatical_gender android.app.system_terms_of_address_enabled true
Bug: 295826542
Bug: 297798866
9 files changed