Add missing double click extension methods and enhance mouse input APIs

[Copilot]

This PR enhances the double click APIs by adding missing extension methods and ensuring proper accessibility of the double click timing property.

Changes Made

New Extension Methods Added

• RightDoubleClick() - Performs right mouse button double click
• MiddleClick() - Performs middle mouse button single click
• MiddleDoubleClick() - Performs middle mouse button double click

All new methods follow the same consistent API pattern as existing methods:

await element.RightDoubleClick(Position.Center, xOffset: 10, yOffset: 5);
await element.MiddleClick();
await element.MiddleDoubleClick(clickTime: TimeSpan.FromMilliseconds(200));

Enhanced Test Coverage

Added comprehensive tests for all new methods:

• CanRightDoubleClickOnButton()
• CanMiddleClickOnButton()
• CanMiddleDoubleClickOnButton()
• DoubleClickTimeIsAccessibleWithoutWinForms() - Verifies the double click timing property works without WinForms dependency

Requirements Fulfilled

✅ Extension methods for double click - Now all mouse buttons support both single and double click operations (Left, Right, Middle)

✅ Double click timing without WinForms - The MouseInput.GetDoubleClickTime property was already properly implemented using Windows API directly:

public static TimeSpan GetDoubleClickTime 
    => TimeSpan.FromMilliseconds(Windows.Win32.PInvoke.GetDoubleClickTime());

This avoids the WinForms dependency that would come from SystemInformation.DoubleClickTime.

API Consistency

The implementation maintains full consistency with existing patterns:

• Same method signatures and parameter names
• Same async/await patterns
• Same return types (Task<Point>)
• Same position and offset support
• Same optional click timing support

Fixes #192.

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