Add a SetSchema API and builders.

They directly construct the proto in frameworks.jar.

The API is not yet implemented.

Test: atest CtsAppSearchTestCases
Bug: 145635424
Change-Id: I4f708fa845a87f171ace437788d2c45161fc38ff
diff --git a/Android.bp b/Android.bp
index 4e2b156..a7ac094 100644
--- a/Android.bp
+++ b/Android.bp
@@ -509,7 +509,8 @@
     static_libs: [
         "exoplayer2-core",
         "android.hardware.wifi-V1.0-java-constants",
-     ],
+    ],
+    libs: ["icing-java-proto-lite"],
     apex_available: ["//apex_available:platform"],
 }