[FormBuilderSearchableDropdown]: Default dropdownSearchTextStyle default TeextStyle schould be Theme.of(context).textTheme.titleMedium

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Package/Plugin version

10.1.0

### Platforms

- [ ] Android
- [X] iOS
- [ ] Linux
- [X] MacOS
- [ ] Web
- [ ] Windows

### Flutter doctor

Flutter doctor

```bash
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• Flutter version 3.16.5 on channel stable at /Applications/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 78666c8dc5 (3 weeks ago), 2023-12-19 16:14:14 -0800
• Engine revision 3f3e560236
• Dart version 3.2.3
• DevTools version 2.28.4

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
• Android SDK at /Users/abibiano/Library/Android/sdk
• Platform android-33, build-tools 33.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
• All Android licenses accepted.

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• Build 15C500b
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[✓] Android Studio (version 2022.3)
• Android Studio at /Applications/Android Studio.app/Contents
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🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
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• Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

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```

### Minimal code example

Code sample

```dart
import 'package:flutter/material.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:form_builder_extra_fields/form_builder_extra_fields.dart';

void main() {
runApp(const MyApp());
}

class MyApp extends StatelessWidget {
const MyApp({super.key});

@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
useMaterial3: true,
),
home: Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: const Text('Test App'),
),
body: Padding(
padding: const EdgeInsets.all(16),
child: Row(
children: [
Expanded(
child: FormBuilderTextField(
name: 'testField1',
initialValue: 'Test field 1',
enabled: true,
decoration: const InputDecoration(
labelText: 'Test 1',
),
textInputAction: TextInputAction.next,
),
),
const SizedBox(width: 16),
Expanded(
child: FormBuilderSearchableDropdown(
name: 'testField2',
initialValue: 'Item2',
enabled: true,
decoration: const InputDecoration(
labelText: 'Test 2',
),
items: const [
'Item1',
'Item2',
'Item3',
],
),
),
],
),
),
),
);
}
}
```

### Current Behavior

The size/style of the FormBuilderSearchableDropdown value is not the same as the size used on the normal FormBuilderTextField.

Applying the Theme.of(context).textTheme.titleMedium to the dropdownSearchTextStyle property solves the problem, but I think this has to be the default style for FormBuilderSearchableDropdown as it's for TextField in Flutter.

### Expected Behavior

dropdownSearchTextStyle property FormBuilderSearchableDropdown has to be the same by default a TextField style.

### Steps To Reproduce

1. Run the sample code

### Aditional information