Add type stubs for mido MIDI library

- Created type stubs for various modules in the mido library including messages, midifiles, parser, ports, sockets, syx, tokenizer, and version.
- Implemented type hints for functions and classes to improve type checking and code clarity.
- Added support for MIDI over TCP/IP in sockets module.
- Included methods for reading and writing SYX files in syx module.
- Enhanced the parser functionality with a dedicated Parser class for MIDI byte streams.
- Established a structure for MIDI file handling with MidiFile and MidiTrack classes.

typings/mido/messages/decode.pyi

@@ -0,0 +1,15 @@
+from collections.abc import Callable, Iterable
+from numbers import Integral
+
+from .specs import MsgDict
+
+_SPECIAL_CASES: dict[int, Callable[[Iterable[int | Integral]], dict[str, object]]]
+
+def decode_message(msg_bytes: Iterable[int | Integral], time: int = 0, check: bool = True) -> MsgDict:
+    """Decode message bytes and return messages as a dictionary.
+
+    Raises ValueError if the bytes are out of range or the message is
+    invalid.
+
+    This is not a part of the public API.
+    """