Support font resource in TextAppearanceSpan

To be able to parcel/unparcel Typeface, keep it in static context.

Bug: 62850669
Test: Manually done
Test: bit CtsTextTestCases:android.text.style.cts.TextAppearanceSpanTest
Change-Id: I408cd33b98d8bb13776560231d1eeaac0a7c6bf8