Introduce FontFamily and its builder

This CL is a ground work of the new Typeface construction API and
nobody uses this class except for CTS now.
I'll add new builder in Typeface to be able to create Typeface
from this FontFamily.

Bug: 72665240
Test: atest FontFamilyTest
Test: CtsWidgetTestCases:EditTextTest
    CtsWidgetTestCases:TextViewFadingEdgeTest
    FrameworksCoreTests:TextViewFallbackLineSpacingTest
    FrameworksCoreTests:TextViewTest FrameworksCoreTests:TypefaceTest
    CtsGraphicsTestCases:TypefaceTest CtsWidgetTestCases:TextViewTest
    CtsTextTestCases FrameworksCoreTests:android.text
    CtsWidgetTestCases:TextViewPrecomputedTextTest

Change-Id: I15d412c367037554d911fc9e20c0cfb44aefb89a