[FEATURE] AttrDict get(...) method

[jonatasalves-hotmart]

Is your feature request related to a problem?

just like dict, AttrDict could have a get method.

In [1]: from opensearch_dsl import AttrDict
In [2]: a = AttrDict({"a": "b"})
In [3]: a
Out[3]: {'a': 'b'}
In [4]: a.a
Out[4]: 'b'
In [5]: a["a"]
Out[5]: 'b'
In [6]: a.get("a", default="c")
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
File ...venv/lib/python3.8/site-packages/opensearch_dsl/utils.py:168, in AttrDict.__getattr__(self, attr_name)
    167 try:
--> 168     return self.__getitem__(attr_name)
    169 except KeyError:

File .../venv/lib/python3.8/site-packages/opensearch_dsl/utils.py:187, in AttrDict.__getitem__(self, key)
    186 def __getitem__(self, key):
--> 187     return _wrap(self._d_[key])

What solution would you like?

Same behaviour as dict.