Add Memory Stop Listener

Part of https://git.h2t.iar.kit.edu/sw/armarx-integration/robots/armar7/documentation/-/issues/82

armarx_core/reconnecting_proxy_client.py

+import abc
+import typing as ty
+
+
+Client = ty.TypeVar("Client")
+
+
+class ReconnectingProxyClient(abc.ABC):
+
+    def __init__(
+            self,
+    ):
+        self._client: ty.Optional[Client] = None
+
+    def _get(
+            self,
+            wait=True,
+            log=None,
+    ) -> ty.Optional[Client]:
+        self._connect(wait=wait, log=log)
+        return self._client
+
+    def _connect(self, wait=True, log=None):
+        if self._client is None:
+            if wait:
+                self.client = self._wait_for_client()
+
+            else:
+                self.client = self._get_client()
+
+    @abc.abstractmethod
+    def _wait_for_client(self) -> Client:
+        ...
+
+    @abc.abstractmethod
+    def _get_client(self) -> ty.Optional[Client]:
+        ...