Add bundle function

To speed up the start, use jsonification to create and persist a JSON of all songs in the library root dir before starting this UI.

#### Bundle

**Create a bundle `.zip` file containg web app and data** that can be uploaded to any web hoster that can host static files.

```bash

python3 -m karaokatalog.ui.bundle $SONG_LIBRARY

```

### Deduplication

**Find and delete exactly duplicated songs**, i.e., songs with the same title and artist that also consist of exactly the same files in the directory.

import json

import logging

from pathlib import Path

from zipfile import ZipFile

from karaokatalog.get_parser import get_parser

from karaokatalog.Library import Library

logging.basicConfig(

    format="%(asctime)s [%(levelname)s] %(message)s", level=logging.INFO

)

STATIC_DIR = Path(__file__).parent.parent / "static"

if __name__ == "__main__":

    parser = get_parser(

        "ui.bundle",

        "Create a bundle ZIP containing the Karaokatalog web app and all data which can be uploaded to a static web server.",

    )

    parser.add_argument(

        "-o",

        "--out-path",

        type=Path,

        default=Path("./karaokatalog.zip"),

        help="The path at which the output ZIP file should be stored",

    )

    args = parser.parse_args()

    with ZipFile(args.out_path, "w") as out_zip:

        for file_path in STATIC_DIR.rglob("*"):

            relative_path = file_path.relative_to(STATIC_DIR)

            out_zip.write(file_path, relative_path)

        songs_json_path = args.library_path / "songs.json"

        if songs_json_path.exists():

            logging.info(f"Using existing songs.json at {songs_json_path}")

            out_zip.write(songs_json_path, "songs.json")

        else:

            logging.info("Loading library")

            library = Library.from_dir(args.library_path)

            logging.info("Library loaded")

            songs = [song.as_dict() for song in library.songs]

            songs_json = json.dumps(songs, ensure_ascii=False, indent=4)

            out_zip.writestr("songs.json", songs_json)