Expose binder for sensitive content protection

the framework will report sensitive content on
the screen, and the sensitive content protection
service will block/unblock projection based on whether
the window is showing senstive content or not.

Bug: 324348549
Test: atest SensitiveContentOnScreenProtectionTest
Change-Id: Ied0ce01407f5ffb8d04eb169d83cf84bac8a1266