feat: restructure renamer package and implement media extraction features

- Updated `pyproject.toml` to reflect new package structure.
- Created `renamer/__init__.py` to initialize the package.
- Implemented `RenamerApp` in `renamer/app.py` for the main application interface.
- Added constants for video extensions in `renamer/constants.py`.
- Developed `MediaExtractor` class in `renamer/extractor.py` for extracting metadata from media files.
- Created various extractor classes in `renamer/extractors/` for handling filename, metadata, and media info extraction.
- Added formatting classes in `renamer/formatters/` for displaying media information and proposed filenames.
- Implemented utility functions in `renamer/utils.py` for detecting file types and extracting media track information.
- Introduced `OpenScreen` in `renamer/screens.py` for user input of directory paths.
- Enhanced error handling and user feedback throughout the application.

renamer/extractors/metadata_extractor.py

@@ -0,0 +1,48 @@
+import mutagen
+from pathlib import Path
+
+
+class MetadataExtractor:
+    """Class to extract information from file metadata"""
+
+    @staticmethod
+    def extract_title(file_path: Path) -> str | None:
+        """Extract title from metadata"""
+        try:
+            info = mutagen.File(file_path)
+            if info:
+                return getattr(info, 'title', None) or getattr(info, 'get', lambda x, default=None: default)('title', [None])[0]
+        except:
+            pass
+        return None
+
+    @staticmethod
+    def extract_duration(file_path: Path) -> float | None:
+        """Extract duration from metadata"""
+        try:
+            info = mutagen.File(file_path)
+            if info:
+                return getattr(info, 'length', None)
+        except:
+            pass
+        return None
+
+    @staticmethod
+    def extract_artist(file_path: Path) -> str | None:
+        """Extract artist from metadata"""
+        try:
+            info = mutagen.File(file_path)
+            if info:
+                return getattr(info, 'artist', None) or getattr(info, 'get', lambda x, default=None: default)('artist', [None])[0]
+        except:
+            pass
+        return None
+
+    @staticmethod
+    def extract_all_metadata(file_path: Path) -> dict:
+        """Extract all metadata"""
+        return {
+            'title': MetadataExtractor.extract_title(file_path),
+            'duration': MetadataExtractor.extract_duration(file_path),
+            'artist': MetadataExtractor.extract_artist(file_path)
+        }