feat(notifiers): Add Matrix notifier support

Introduced a new notifier for Matrix to allow messages to be sent to specified rooms on a Matrix server. This extends the application's notification system, enabling it to interact with Matrix homeservers using room IDs and access tokens defined in the configuration. The added `Matrix` class supports basic notification functionality, including determining if the notifier is enabled and sending messages. This enhancement caters to users within the Matrix ecosystem, providing a more integrated experience for alert and notification management.

src/trackbert/notifiers/matrix.py

@@ -0,0 +1,24 @@
+from typing import Dict, Any
+
+from urllib.request import urlopen
+
+from trackbert.classes.notifier import BaseNotifier
+
+
+class Matrix(BaseNotifier):
+    def __init__(self, config: Dict[str, Any], *args, **kwargs):
+        self.config = config
+
+    def enabled(self) -> bool:
+        return bool(self.config)
+
+    def notify(self, title: str, message: str, urgent: bool = False) -> None:
+        homeserver = self.config["homeserver"]
+        room_id = self.config["room_id"]
+        token = self.config["token"]
+
+        url = f"{homeserver}/_matrix/client/r0/rooms/{room_id}/send/m.room.message?access_token={token}"
+
+        data = {"msgtype": "m.text", "body": f"{title}\n\n{message}"}
+
+        urlopen(url, data=data)