feat(metadata): ✨ add customizable metadata delimiters for artists

* Introduced `metadata_delimiter_artist` and `metadata_delimiter_album_artist` settings.
* Updated `name_builder_artist` and `name_builder_album_artist` functions to utilize the new delimiters.
* This allows users to specify their preferred delimiter for artist names in metadata.

tidal_dl_ng/model/cfg.py

@@ -50,6 +50,8 @@ class Settings:
     window_y: int = 50
     window_w: int = 1200
     window_h: int = 800
+    metadata_delimiter_artist: str = "; "
+    metadata_delimiter_album_artist: str = "; "
 
 
 @dataclass_json
@@ -109,6 +111,8 @@ class HelpSettings:
     window_y: str = "Y-Coordinate of saved window location."
     window_w: str = "Width of saved window size."
     window_h: str = "Height of saved window size."
+    metadata_delimiter_artist: str = "Metadata tag delimiter for multiple artists. Default: '; '"
+    metadata_delimiter_album_artist: str = "Metadata tag delimiter for multiple album artists. Default: '; '"
 
 
 @dataclass_json