Add a simple cross platfrom IPC lib in core:os

[A-Boring-Square]

Problem

Odin currently does not provide a cross-platform local IPC abstraction in core:os.
Developers who need inter process communication must implement platform-specific solutions themselves, typically using Unix domain sockets on POSIX systems and Named Pipes on Windows. This results in duplicated effort across projects and encourages the creation of multiple third-party IPC libraries with differing APIs.

Proposed Solution

Provide a simple abstraction over OS specific IPC using the io.Stream interface and has support for:

• Windows: Named Pipes
• POSIX: Unix Domain Sockets
• Any other IPC system for targets that Odin supports

Implementation

This could be implemented via a struct like this

Chanel :: struct {
    stream: io.Stream,
    platform_data: rawptr,
}

This would allow the IPC interface to use the standard core:io interface for IPC across different OSs

Why should this be in core:os/ipc and not core:net/ipc

The proposed API represents local operating system IPC facilities rather than network communication.
While the POSIX implementation may use Unix domain sockets internally, the abstraction is intended for communication between processes on the same machine. The Windows implementation would use Named Pipes, and other platforms may use different native IPC mechanisms.

Because the purpose of the API is to expose local IPC rather than networking, core:os/ipc appears to be a more appropriate location than core:net/ipc. The package would provide a common interface over operating-system IPC primitives while hiding platform-specific implementation details.

[heavyrain266]

All of currently supported targets support UNIX Domain Sockets (Windows included). Mixing named pipes, xpc, and unix sockets into unified API is a terrible idea in practices, that's because each handles messages in different way. As an example, named pipes have built-in framing, while unix sockets don't, on top of that xpc expects dictionaries instead.