move the log file viewer to its own plugin

We plan to have multiple different types of tabs.

raven/plugins/ravenlog/Tab.py

@@ -0,0 +1,23 @@
+from abc import abstractmethod
+
+from PyQt6.QtWidgets import QWidget
+
+
+class Tab(QWidget):
+
+    def __init__(self, unique_id: str, title: str):
+        super(Tab, self).__init__()
+        self.unique_id = unique_id
+        self.title = title
+
+    @abstractmethod
+    def get_status_text(self) -> str:
+        pass
+
+    @abstractmethod
+    def get_file(self) -> str:
+        pass
+
+    @abstractmethod
+    def destruct(self):
+        pass