Allow TextAnimator TypefaceCaches to be shared

This also shares the same typeface cache with the underlying
textInterpolator, preventing it from unnessecarially re-making
cached typefaces in some cases.

Bug: 278470896
Bug: 278479859
Bug: 278225145
Test: Checked profile for reduced typeface objects
Change-Id: Ic7ff5877e69e8b5b6afd9b9c2b086b448185d769