refactor(Android, Tabs): Move image loader logic to TabsImageLoader (#3292)

## Description

Minor refactor, separating icon loading logic from the view manager.

Fixes
software-mansion/react-native-screens-labs#469

## Changes

- Moving the logic related to icon loading to `TabsImageLoader`

## Test code and steps to reproduce

Performed regression testing on TestBottomTabs

## Checklist

- [x] Included code example that can be used to test this change
- [x] Ensured that CI passes

Author: t0maboro

android/src/main/java/com/swmansion/rnscreens/gamma/tabs/TabScreenViewManager.kt

@@ -1,7 +1,5 @@
 package com.swmansion.rnscreens.gamma.tabs
 
-import android.os.Handler
-import android.os.Looper
 import com.facebook.react.bridge.Dynamic
 import com.facebook.react.bridge.ReadableMap
 import com.facebook.react.module.annotations.ReactModule
@@ -194,15 +192,7 @@ class TabScreenViewManager :
     ) {
         val uri = value?.getString("uri")
         if (uri != null) {
-            val context = view.context
-            loadTabImage(context, uri) { drawable ->
-                // Since image loading might happen on a background thread
-                // ref. https://frescolib.org/docs/intro-image-pipeline.html
-                // We should schedule rendering the result on the UI thread
-                Handler(Looper.getMainLooper()).post {
-                    view.icon = drawable
-                }
-            }
+            loadTabImage(view.context, uri, view)
         }
     }
 

android/src/main/java/com/swmansion/rnscreens/gamma/tabs/image/TabsImageLoader.kt

@@ -2,6 +2,8 @@ package com.swmansion.rnscreens.gamma.tabs.image
 
 import android.content.Context
 import android.graphics.drawable.Drawable
+import android.os.Handler
+import android.os.Looper
 import android.util.Log
 import androidx.core.graphics.drawable.toDrawable
 import androidx.core.net.toUri
@@ -13,8 +15,24 @@ import com.facebook.drawee.backends.pipeline.Fresco
 import com.facebook.imagepipeline.image.CloseableImage
 import com.facebook.imagepipeline.image.CloseableStaticBitmap
 import com.facebook.imagepipeline.request.ImageRequestBuilder
+import com.swmansion.rnscreens.gamma.tabs.TabScreen
 
 internal fun loadTabImage(
+    context: Context,
+    uri: String,
+    view: TabScreen,
+) {
+    // Since image loading might happen on a background thread
+    // ref. https://frescolib.org/docs/intro-image-pipeline.html
+    // We should schedule rendering the result on the UI thread
+    loadTabImageInternal(context, uri) { drawable ->
+        Handler(Looper.getMainLooper()).post {
+            view.icon = drawable
+        }
+    }
+}
+
+private fun loadTabImageInternal(
     context: Context,
     uri: String,
     onLoaded: (Drawable) -> Unit,