[CD Settings] Use ViewOutlineProvider to draw curved border

The existing solution apply box border to the displayBlock in order to
ensure Surface not leaking out behind the rounded corner.

While the box border itself fade into the background due to the gap in
displayBlocks in connected displays mode, the sharp box border will be
visible when displayBlocks are stacked in mirroring mode.

Applying stacked mirrored displays will be done in the next CL, but
here's the sample demo
Before: http://shortn/_vds67h67lV
After: http://shortn/_Y3gEbRbczV

Current CD pane with the change: http://shortn/_zqtwYJgKtA

Bug: 401059862
Test: atest DisplayBlockTest
Flag: com.android.settings.flags.display_topology_pane_in_display_list
Change-Id: Ibd58d0387dc3cc78e7e4e929b00559c086e1650c