Modify Smartspace UI templates APIs.

1. Add a SmartspaceText class to warp CharSequence with the info of TrunctAtPosition;
2. Add a field shouldTint to SmartspaceIcon.

Test: atest CtsSmartspaceServiceTestCases
Bug: 213926964
CTS-Coverage-Bug: 214471292
Change-Id: If9352fcced3db4e398d49dae8ff17f86f5765b47