[feature] Easy way to get test_description, test_name, ecc.

Hello,
this is a feature request.
I need to get easily the test description, name, ecc inside a private function. I do not want to pass them as strings. I know that it is quite easy to set them

```
allure.dynamic.description("""blah blah""")
```

I asked on [Stackoverflow ](https://stackoverflow.com/questions/57047461/get-dynamic-test-description-in-allure-pytest )how to get them and here there is the code:

```
import allure
from allure_commons._core import plugin_manager
from allure_pytest.listener import AllureListener

@allure.title("MYTITLE")
def test_A1(request):
allure.dynamic.description("""MYDESC""")
myfunct()

def myfunct():
plugin = next(p for p in plugin_manager.get_plugins() if isinstance(p, AllureListener))
testdescription = plugin.allure_logger.get_test(None).description
...
```

I would like to know whether in future versions it could be possibile to add a "getter" method.
Thanks,
Riccardo

首先阅读 issue 中公开 Allure API 的使用方式，以及提到的 allure_pytest.listener.AllureListener 和 allure_commons._core.plugin_manager 入口点。跟踪当前如何通过 allure_logger.get_test(None) 访问测试元数据。完成的标准是：一个受支持的 getter 能够公开测试描述、名称和相关元数据，而不要求调用方传入字符串或检查私有内部实现。

由索引模型根据 Issue 内容生成。