move the log file viewer to its own plugin

We plan to have multiple different types of tabs.

raven/plugins/logfileplugin.py

@@ -0,0 +1,38 @@
+import os.path
+from typing import Callable, Optional
+
+from PyQt6.QtWidgets import QMessageBox
+
+from fulltabwidget import FullTabWidget
+from logFileModel import LogFileModel
+from raven.pluginbase import PluginBase
+from raven.plugins.ravenlog.Tab import Tab
+from settings import Settings
+
+
+class LogFilePlugin(PluginBase):
+    def __init__(self):
+        super(LogFilePlugin, self).__init__()
+        self.settings = None
+        self.tr = None
+
+    def set_settings(self, settings: Settings):
+        self.settings = settings
+
+    def set_translator(self, tr: Callable[[str], str]):
+        self.tr = tr
+
+    def create_tab(self, file: str) -> Optional[Tab]:
+        if not os.path.isfile(file):
+            message = QMessageBox(QMessageBox.Icon.Warning, "File not found",
+                                  "'%s' is not a file or cannot be opened" % file)
+            message.exec()
+            return None
+
+        realpath = os.path.realpath(file)
+        filename = os.path.basename(realpath)
+
+        model = LogFileModel(file, self.settings)
+        tab = FullTabWidget(model, unique_id=realpath, title=filename)
+
+        return tab