feat: appearance (#723)

## 📜 Description

Added `appearance` property to `KeyboardEventData`.

## 💡 Motivation and Context

If user uses `light` theme but prefer dark keyboard, then
`KeyboardToolbar` will be white (though it should be `dark` to match the
keyboard color). So I thought it will be useful to add this property
(additionally this property can be needed for
`KeyboardController.retain()` API).

On Android keyboard color is controlled via settings and the keyboard
color is not exposed through the public API. But on most of Android
devices keyboard color by default matches system settings, so in
`appearance` I expose system preference (this is the best what I can do
to try to match this).

## 📢 Changelog

<!-- High level overview of important changes -->
<!-- For example: fixed status bar manipulation; added new types
declarations; -->
<!-- If your changes don't affect one of platform/language below - then
remove this platform/language -->

### Docs

- added a reference about `appearance` property in `KeyboardEvents`
section;

### JS

- updated `KeyboardEventData` type;

### iOS

- added `UIKeyboardAppearance` extension;

### Android

- added `ReactThemedContext.appearance` extension;

## 🤔 How Has This Been Tested?

Tested manually on:
- iPhone 15 Pro
- Pixel 7 Pro (API 35).

## 📸 Screenshots (if appropriate):


![image](https://github.com/user-attachments/assets/54398782-2054-4a7c-8b41-8495532b50b1)

## 📝 Checklist

- [x] CI successfully passed
- [x] I added new mocks and corresponding unit-tests if library API was
changed

android/src/main/java/com/reactnativekeyboardcontroller/extensions/ThemedReactContext.kt

@@ -1,5 +1,7 @@
 package com.reactnativekeyboardcontroller.extensions
 
+import android.content.Context
+import android.os.Build
 import com.facebook.react.bridge.ReactContext
 import com.facebook.react.bridge.WritableMap
 import com.facebook.react.modules.core.DeviceEventManagerModule
@@ -34,3 +36,19 @@ fun ThemedReactContext?.emitEvent(
 
   Logger.i("ThemedReactContext", event)
 }
+
+val ThemedReactContext?.appearance: String
+  get() =
+    when {
+      this == null -> "default"
+      isSystemDarkMode(this) -> "dark"
+      else -> "light"
+    }
+
+private fun isSystemDarkMode(context: Context): Boolean =
+  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+    (context.getSystemService(Context.UI_MODE_SERVICE) as? android.app.UiModeManager)
+      ?.nightMode == android.app.UiModeManager.MODE_NIGHT_YES
+  } else {
+    false
+  }

android/src/main/java/com/reactnativekeyboardcontroller/listeners/KeyboardAnimationCallback.kt

@@ -15,6 +15,7 @@ import com.facebook.react.views.textinput.ReactEditText
 import com.facebook.react.views.view.ReactViewGroup
 import com.reactnativekeyboardcontroller.constants.Keyboard
 import com.reactnativekeyboardcontroller.events.KeyboardTransitionEvent
+import com.reactnativekeyboardcontroller.extensions.appearance
 import com.reactnativekeyboardcontroller.extensions.dispatchEvent
 import com.reactnativekeyboardcontroller.extensions.dp
 import com.reactnativekeyboardcontroller.extensions.emitEvent
@@ -428,6 +429,7 @@ class KeyboardAnimationCallback(
     params.putDouble("timestamp", System.currentTimeMillis().toDouble())
     params.putInt("target", viewTagFocused)
     params.putString("type", FocusedInputHolder.get()?.keyboardType)
+    params.putString("appearance", context.appearance)
 
     return params
   }

docs/docs/api/keyboard-events.md

@@ -32,6 +32,7 @@ type KeyboardEventData = {
   timestamp: number; // timestamp of the event from native thread
   target: number; // tag of the focused TextInput
   type: string; // `keyboardType` property from focused `TextInput`
+  appearance: string; // `keyboardAppearance` property from focused `TextInput`
 };
 ```
 

ios/events/KeyboardEventEmitterPayload.swift

@@ -17,6 +17,7 @@ public func buildEventParams(_ height: Double, _ duration: Int, _ tag: NSNumber)
   data["timestamp"] = Date.currentTimeStamp
   data["target"] = tag
   data["type"] = input?.keyboardType.name ?? "default"
+  data["appearance"] = input?.keyboardAppearance.name ?? "default"
 
   return data
 }

ios/extensions/UIKeyboardAppearance.swift

@@ -0,0 +1,21 @@
+//
+//  UIKeyboardAppearance.swift
+//  Pods
+//
+//  Created by Kiryl Ziusko on 08/12/2024.
+//
+
+import Foundation
+import UIKit
+
+public extension UIKeyboardAppearance {
+  var name: String {
+    switch self {
+    case .default: return "default"
+    case .dark: return "dark"
+    case .light: return "light"
+    @unknown default:
+      return "default"
+    }
+  }
+}

ios/protocols/TextInput.swift

@@ -11,6 +11,7 @@ import UIKit
 
 public protocol TextInput: AnyObject {
   var keyboardType: UIKeyboardType { get }
+  var keyboardAppearance: UIKeyboardAppearance { get }
   func focus()
 }
 

src/types.ts

@@ -148,7 +148,8 @@ export type KeyboardEventData = {
   duration: number;
   timestamp: number;
   target: number;
-  type: TextInputProps["keyboardType"];
+  type: NonNullable<TextInputProps["keyboardType"]>;
+  appearance: NonNullable<TextInputProps["keyboardAppearance"]>;
 };
 export type KeyboardEventsModule = {
   addListener: (