fix: 允许通过实体模型调用对应模型的所有公共静态方法

[gitlilimin]

原本实体模型的 __callStatic() 中是写死了对应模型的几个方法，只有这些方法支持对实体模型对应的模型调用，代码如下

public static function __callStatic($method, $args)
{
    $entity = new static();
    if (in_array($method, ['destroy', 'create', 'update', 'saveAll'])) {
        // 调用model的静态方法
        $db = $entity->model();
    } else {
        // 调用Query类查询方法
        $db = $entity->model()->db();
    }

    return call_user_func_array([$db, $method], $args);
}

在升级orm 4的过程中，有时候无法避免在传统模型中存在一些公共的静态方法，因此实体模型应该支持对应模型公共静态方法的调用，而不是固定写死几个内置的方法

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 52.08%. Comparing base (006ad4b) to head (2e76ce3).

Files with missing lines	Patch %	Lines
src/Entity.php	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                4.0     #818      +/-   ##
============================================
+ Coverage     52.06%   52.08%   +0.01%     
  Complexity     3507     3507              
============================================
  Files            74       74              
  Lines          8313     8316       +3     
============================================
+ Hits           4328     4331       +3     
  Misses         3985     3985              

Flag	Coverage Δ
unittests	52.08% <80.00%> (+0.01%)	⬆️

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