Simplify InlineSwitchPayloads and generalize get/set method

InlineSwitchPayload now assumes that all switches will be
stored as 1 or 0, which simplifies the code.

Moves Availability into ResultPayload, so that custom
payloads can be created to set/get values which are more
complicated than stotring ints (like bluetooth or DnD),
and give more expressive reasons when unavailable.

Bug: 62022517
Test: make RunSettingsRoboTests
Change-Id: I87e6fc041bfd398e7daf6e6e479d502930d36f0f

tests/robotests/src/com/android/settings/search/InlineSwitchViewHolderTest.java

@@ -86,7 +86,7 @@ public class InlineSwitchViewHolderTest {
 
     @Test
     public void testBindViewElements_AllUpdated() {
-        when(mPayload.getSwitchValue(any(Context.class))).thenReturn(true);
+        when(mPayload.getValue(any(Context.class))).thenReturn(1);
         SearchResult result = getSearchResult();
         mHolder.onBind(mFragment, result);
         // Precondition: switch is on.
@@ -102,10 +102,12 @@ public class InlineSwitchViewHolderTest {
 
     private SearchResult getSearchResult() {
         SearchResult.Builder builder = new SearchResult.Builder();
+
         builder.setTitle(TITLE)
                 .setSummary(SUMMARY)
                 .setRank(1)
-                .setPayload(new InlineSwitchPayload("", 0, null, null))
+                .setPayload(new InlineSwitchPayload("" /* uri */, 0 /* mSettingSource */,
+                        1 /* onValue */, null /* intent */, true /* isDeviceSupported */))
                 .addBreadcrumbs(new ArrayList<>())
                 .setIcon(mIcon)
                 .setPayload(mPayload)