Add a NearbyScanRequest for requesting scan.

Currently only scan type and worksource are supported in the scan
request. More parameters will be added in the future.

Bug: 189355156
Test: atest NearbyUnitTests

Change-Id: I73d9e48865d33f5b13b29acac30eadc1a9eb9168
diff --git a/nearby/TEST_MAPPING b/nearby/TEST_MAPPING
new file mode 100644
index 0000000..8bc5bc6
--- /dev/null
+++ b/nearby/TEST_MAPPING
@@ -0,0 +1,17 @@
+{
+  "presubmit": [
+    {
+      "name": "NearbyUnitTests"
+    }
+  ],
+  "postsubmit": [
+    {
+      "name": "NearbyUnitTests"
+    }
+  ],
+  "mainline-presubmit": [
+    {
+      "name": "NearbyUnitTests[com.google.android.nearby.apex]"
+    }
+  ]
+}
\ No newline at end of file