Make FontMetricsUtil internal (facebook#50506)

Summary:
This class can be internalized as part of the initiative to reduce the public API surface. I've checked there are [no relevant OSS usages](https://github.com/search?type=code&q=NOT+is%3Afork+NOT+org%3Afacebook+NOT+repo%3Areact-native-tvos%2Freact-native-tvos+NOT+repo%3Anuagoz%2Freact-native+NOT+repo%3A2lambda123%2Freact-native+NOT+repo%3Abeanchips%2Ffacebookreactnative+NOT+repo%3AfabOnReact%2Freact-native-notes+NOT+user%3Ahuntie+NOT+user%3Acortinico+NOT+repo%3AMaxdev18%2Fpowersync_app+NOT+repo%3Acarter-0%2Finstagram-decompiled+NOT+repo%3Am0mosenpai%2Finstadamn+NOT+repo%3AA-Star100%2FA-Star100-AUG2-2024+NOT+repo%3Alclnrd%2Fdetox-scrollview-reproductible+NOT+repo%3ADionisisChytiris%2FWorldWiseTrivia_Main+NOT+repo%3Apast3l%2Fhi2+NOT+repo%3AoneDotpy%2FCaribouQuest+NOT+repo%3Abejayoharen%2Fdailytodo+NOT+repo%3Amolangning%2Freversing-discord+NOT+repo%3AScottPrzy%2Freact-native+NOT+repo%3Agabrieldonadel%2Freact-native-visionos+NOT+repo%3AGabriel2308%2FTestes-Soft+NOT+repo%3Adawnzs03%2FflakyBuild+NOT+repo%3Acga2351%2Fcode+NOT+repo%3Astreeg%2Ftcc+NOT+repo%3Asoftware-mansion-labs%2Freact-native-swiftui+NOT+repo%3Apkcsecurity%2Fdecompiled-lightbulb+com.facebook.react.views.text.FontMetricsUtil).

## Changelog:

[INTERNAL] - Make com.facebook.react.views.text.FontMetricsUtil internal

Pull Request resolved: facebook#50506

Test Plan:
```bash
yarn test-android
yarn android
```

Reviewed By: javache

Differential Revision: D72549765

Pulled By: cortinico

fbshipit-source-id: b7e29dfb716ce7c93620b14adec1425345b13ac1

Author: mateoguzmana

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -6513,11 +6513,6 @@ public final class com/facebook/react/views/text/DefaultStyleValuesUtil {
 	public static final fun getDefaultTextColorHint (Landroid/content/Context;)Landroid/content/res/ColorStateList;
 }
 
-public final class com/facebook/react/views/text/FontMetricsUtil {
-	public static final field INSTANCE Lcom/facebook/react/views/text/FontMetricsUtil;
-	public static final fun getFontMetrics (Ljava/lang/CharSequence;Landroid/text/Layout;Landroid/text/TextPaint;Landroid/content/Context;)Lcom/facebook/react/bridge/WritableArray;
-}
-
 public abstract class com/facebook/react/views/text/ReactBaseTextShadowNode : com/facebook/react/uimanager/LayoutShadowNode {
 	public static final field DEFAULT_TEXT_SHADOW_COLOR I
 	public static final field PROP_SHADOW_COLOR Ljava/lang/String;

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/FontMetricsUtil.kt

@@ -14,14 +14,14 @@ import android.text.TextPaint
 import com.facebook.react.bridge.Arguments
 import com.facebook.react.bridge.WritableArray
 
-public object FontMetricsUtil {
+internal object FontMetricsUtil {
 
   private const val CAP_HEIGHT_MEASUREMENT_TEXT = "T"
   private const val X_HEIGHT_MEASUREMENT_TEXT = "x"
   private const val AMPLIFICATION_FACTOR = 100f
 
   @JvmStatic
-  public fun getFontMetrics(
+  fun getFontMetrics(
       text: CharSequence,
       layout: Layout,
       paint: TextPaint,