Adapt ReadableMapBuffer to MapBuffer interface

Summary:
Updates `ReadableMapBuffer` to conform to `MapBuffer` interface, to allow interchangeable use of `Readable/WritableMapBuffer` in the code.

Notable changes:
- MapBuffer.Entry getters are now represented as Kotlin properties and appended `Value` suffix (e.g. `entry.getInt()` becomes `entry.getIntValue()` in Java, or `entry.intValue` in Kotlin)
- `ByteBuffer` is imported in constructor instead of on demand. This method doesn't copy the data as the bytes are read directly from native heap, and benchmarking a 500-byte `MapBuffer` shows no difference in import speed.
- Internal logic of `ReadableMapBuffer` uses `UShort` kotlin type for key retrieval, for more correct representation of values.
- Explicit exception throws are replaced with `require` and `check` methods for `IllegalArgumentException` and `IllegalStateException` (default FB conversion).

The change also updates `ReadableMapBuffer` usages to `MapBuffer` interface where possible (virtually everywhere except JNI methods).

Changelog: [Android][Changed] - Adopt `MapBuffer` interface for `ReadableMapBuffer`

Reviewed By: mdvacca

Differential Revision: D35218633

fbshipit-source-id: 515dd974c27b2978ade325b2e1750ab8f068a20a

ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewManager.java

@@ -15,7 +15,7 @@ import com.facebook.react.bridge.BaseJavaModule;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReadableArray;
 import com.facebook.react.bridge.ReadableMap;
-import com.facebook.react.common.mapbuffer.ReadableMapBuffer;
+import com.facebook.react.common.mapbuffer.MapBuffer;
 import com.facebook.react.touch.JSResponderHandler;
 import com.facebook.react.touch.ReactInterceptingViewGroup;
 import com.facebook.react.uimanager.annotations.ReactProp;
@@ -333,9 +333,9 @@ public abstract class ViewManager<T extends View, C extends ReactShadowNode>
    * ViewManager
    *
    * @param context {@link com.facebook.react.bridge.ReactContext} used for the view.
-   * @param localData {@link ReadableMapBuffer} containing "local data" defined in C++
-   * @param props {@link ReadableMapBuffer} containing JS props
-   * @param state {@link ReadableMapBuffer} containing state defined in C++
+   * @param localData {@link MapBuffer} containing "local data" defined in C++
+   * @param props {@link MapBuffer} containing JS props
+   * @param state {@link MapBuffer} containing state defined in C++
    * @param width width of the view (usually zero)
    * @param widthMode widthMode used during calculation of layout
    * @param height height of the view (usually zero)
@@ -353,10 +353,10 @@ public abstract class ViewManager<T extends View, C extends ReactShadowNode>
    */
   public long measure(
       Context context,
-      ReadableMapBuffer localData,
-      ReadableMapBuffer props,
+      MapBuffer localData,
+      MapBuffer props,
       // TODO(T114731225): review whether state parameter is needed
-      @Nullable ReadableMapBuffer state,
+      @Nullable MapBuffer state,
       float width,
       YogaMeasureMode widthMode,
       float height,