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/syx.pyi

@@ -0,0 +1,28 @@
+"""
+Read and write SYX file format
+"""
+
+from _typeshed import FileDescriptorOrPath
+
+from .messages import Message
+
+def read_syx_file(filename: FileDescriptorOrPath) -> list[Message]:
+    """Read sysex messages from SYX file.
+
+    Returns a list of sysex messages.
+
+    This handles both the text (hexadecimal) and binary
+    formats. Messages other than sysex will be ignored. Raises
+    ValueError if file is plain text and byte is not a 2-digit hex
+    number.
+    """
+
+def write_syx_file(filename: FileDescriptorOrPath, messages: list[Message], plaintext: bool = False) -> None:
+    """Write sysex messages to a SYX file.
+
+    Messages other than sysex will be skipped.
+
+    By default this will write the binary format.  Pass
+    `plaintext=True` to write the plain text format (hex encoded
+    ASCII text).
+    """