Added return types, removed unused Yii from model.php, replaced imports

[Erkinbek]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	Added return types

[what-the-diff]

PR Summary

• Modification on controller.php in generators/crud/default directory

  • The usage of the yii\web\Response library has been introduced. This could facilitate handling of HTTP requests and responses within the CRUD operations.
  • The return types for several important operations, dealing with display (actionIndex, actionView), manipulation (actionCreate, actionUpdate, actionDelete) and retrieval (findModel) of data, were updated. This could enable more controlled response management, providing flexibility in responses, adapting as either string , Response or array type.

• Updates to model.php in generators/model/default directory

  • New return types for several core functions responsible for database interaction and data representation in the application have been introduced. These will establish a clear contract for what these functions are expected to return, possibly improving code readability and maintenance.

• Changes in controller.php in generators/module/default directory

  • The return type for the primary display function, actionIndex(), has been changed to string. This change is expected to provide better control and management of the output generated by this function.

From a less-technical perspective, these changes should enhance the reliability and consistency of the application, and potentially make it less prone to errors related to mismatched or unexpected return types.

[samdark]

It won't work with older PHP versions.

[uldisn]

It won't work with older PHP versions.

If create own templates for each PHP version, it will work.

[Erkinbek]

All time when i generate code with gii, my idea (PHPStorm) will shows this lines as not optimized code. So if people are using old versions of php, just need close this PR. Thank you for your attention :)

[uldisn]

Idea no bad! In https://github.com/yiisoft/yii2-gii/blob/master/src/generators/model/Generator.php#L313

if (phpversion() < '5.2' ) {
    $template = 'model_52.php';
} elseif {phpversion() >= '5.2' &&  phpversion() < '5.7'} {
   $template = 'model_52_57.php';
} elseif {phpversion() >= '5.7' &&  phpversion() < '7.4'} {
   $template = 'model_57_74.php';
} {
   $template = 'model_74.php';
}
$files[] = new CodeFile(
    Yii::getAlias('@' . str_replace('\\', '/', $this->ns)) . '/' . $modelClassName . '.php',
    $this->render($template, $params)
);

For each PHP version own model_*php.

[Erkinbek]

OK. I'll fix it