feat(ds4): add updateFlags byte for output callback

[AhmedAmrNabil]

Description

Adds an UpdateFlags byte to the DualShock4 OutputState struct and updates the corresponding libVIIPER callbacks.

When an output report is received for a DualShock4 device, it contains LED data, rumble data, flash data, and an update byte indicating which fields are valid:

• Bit 0 set → update rumble
• Bit 1 set → update LED
• Bit 2 set → update flash

This PR adds that update byte to the OutputState struct so consumers can tell which fields changed.

Related Issue

Fixes #32

Motivation and Context

Previously, output callbacks only delivered the raw 7 bytes (rumble, LED, flash) with no way to know which of them actually changed. Without the update flags, consumers had no way to distinguish a rumble-only update from an LED-only update or a combination of both. This change exposes that information directly.

How Has This Been Tested?

• Tested with hardware (specify configuration)
• Unit tests
• Code review only

Type of Change

• Bug fix (non-breaking change addressing an issue)
• New feature (non-breaking change adding functionality)
• Breaking change (fix or feature causing existing functionality to change)
• Documentation update

Checklist

• My code follows the code style of this project
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed