Add synthetic columns to voicemail table.

- Since our voicemail table supports getInputStream and getOutputStream
  we should also support the columns for DISPLAY_NAME and SIZE, since
  these are expected to exist for helping other apps share files -
  attaching to an email in GMail for example.
- Uses an SQL hack to combine a suitably localized string with the
  number column for the display name.

Bug: 5066115
Change-Id: I48a08ade2a3a2a28a1d3e3415ec27dd956056d44
2 files changed