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/tokenizer.pyi

@@ -0,0 +1,26 @@
+from collections.abc import Generator, Iterable
+from numbers import Integral
+from typing import Any
+
+class Tokenizer:
+    """
+    Splits a MIDI byte stream into messages.
+    """
+    def __init__(self, data: Iterable[int] | None = ...) -> None:
+        """Create a new decoder."""
+
+    def feed_byte(self, byte: int | Integral) -> None:
+        """Feed MIDI byte to the decoder.
+
+        Takes an int in range [0..255].
+        """
+
+    def feed(self, data: Iterable[int]) -> None:
+        """Feed MIDI bytes to the decoder.
+
+        Takes an iterable of ints in in range [0..255].
+        """
+
+    def __len__(self) -> int: ...
+    def __iter__(self) -> Generator[Any, Any]:
+        """Yield messages that have been parsed so far."""