adds a method to the client to delete a subscription (using uaclient) and the associated sync method

Somehow the config got lost

* Adds missing method: status_change_notification

See for details: https://github.com/FreeOpcUa/opcua-asyncio/discussions/1257

* passes a StatusChangeNotification to the status_change_notification callback of the subscription handler as specified in the method arguments and updates the test accordingly

* add enum/struct import for xml

* remove warning for doc elements

* respect datatype in insert order

directly import structs/enums

* fix unittest

the new import need all variables a hand . So register the the additional types before

* fix case in path

* prevent regreistration of class

* fix test because of changed import order

* Add nodeset via git submodule

* handle alias

* use submodule

* Add "Opc.Ua.PlasticsRubber.GeneralTypes.NodeSet2.xml

* prevent endlessloop in sort nodes

* Add dependabot

* correct merge error

* generate log messeges on invald certs

* server use _application_uri

* use correct socket method

* replaced os.path with pathlib.Path

* fixed some type hinting; added FIXME for critical vulnerability

* added string and path support for certificate paths because path only broke the API. BUT we should stop using strings for paths in the future..

---------

Co-authored-by: ratara <noreply>

* allow optional arrays

* is list fix for py 3.8

* finish optional array support

Fix `MonitoredItemServer._is_data_changed`, with as trigger `ua.DataChangeTrigger.StatusValueTimestamp` is used.

Currently with  `ua.DataChangeTrigger.StatusValueTimestamp` it only triggers when the SourceTimeStamp or the StatusCodes changes. Not on value updates.

According to Part 4 7.17.2 DataChangeFilter when the trigger is `ua.DataChangeTrigger.StatusValueTimestamp` is should trigger if either StatusCode, value or SourceTimeStamp changes.

No tests where available for monitored items, test added for this situation.

The value rank should be one dimension.

This is especially handy when the server runs behind NAT or inside docker container,
but a static EndpointUrl cannot be used because the host is multihomed.

* Python typing friendly
* Make optional basic type fields default None

Requires PR #1224 else the following tests will fail:
- test_common.py
  -	test_alias
    -		client
- test_unit.py
  - test_custom_structs

See discussion at #1067.

Allow registration of own (de)serializer for extension objects that are not in the ua namespace.
(see original TODO in code)

example:
```python
@dataclass
class YourDataType:

    data_type = ua.NodeId.from_string('''ns=2;i=3007''')

    Encoding: ua.UInt32 = field(default=0, repr=False, init=False, compare=False)
    ID: ua.String = ua.String()
    Description: Optional[ua.String] = None

ua.register_extension_object("YourDataType",
                                               ua.NodeId.from_string( f"ns=2;i=5002"),
                                               YourDataType,
                                                YourDataType.data_type)
```

When event is save it is added to  self._events[event.emitting_node], only that list is never initialized.