The changes add a custom header bar with window control buttons (close, maximize/restore, minimize) to the Linux Wayland platform implementation. This provides a consistent user experience for window management across platforms.

The header bar is implemented using GTK widgets and is added to the top of the application window. The drag area of the header bar is also used to enable window moving and resizing functionality.

## Explanation
The changes made in this commit ensure that the window is only maximized if it is also resizable. This is to prevent issues where a non-resizable window is maximized, which could lead to unexpected behavior.

The main changes are:

1. In the `set_maximized` function, the code checks if the window is resizable before maximizing it. If it's not resizable, the window is not maximized.
2. In the `is_maximizable` function, the code checks if the window is resizable and if the maximized state is true before returning `true`.

These changes improve the overall behavior and consistency of the window maximization functionality.

This commit introduces a new `WindowMaximizeProcess` struct that handles the
step-by-step process of maximizing a window. The changes include:

- Implement the `WindowMaximizeProcess` struct with methods to handle the
  maximize process on linux.
- Update the `EventLoop` and `Window` modules to use the new
  `WindowMaximizeProcess` struct when handling window maximize requests.
- Add a new `KeyboardInput` event handler to the `resizable.rs` example to
  toggle the window's maximized state.

The changes in this commit focus on improving the handling of window button events on Linux platforms. The key changes are:

1. Moved the `LMB` constant declaration to the correct location to avoid duplicating it.
2. Removed the Wayland-specific button press event handling, as it was redundant and not necessary.
3. Simplified the window button event handling by removing the unnecessary logic related to Wayland-specific header bar handling.

These changes help to simplify the event loop implementation and make the code more maintainable.