Add GPIO functions (I2C, trigger, and sleep) to SplashKit

[XQuestCode]

Pull Request Description

Title: Add GPIO functions (I2C, trigger, and sleep) to SplashKit

Description:
This PR introduces new GPIO-related functionalities to SplashKit, including I2C communication, GPIO pin triggering, and sleep functions. These additions allow users to interact with hardware at a low level, specifically designed for Raspberry Pi GPIO operations. The added functions include:

• I2C communication (open, close, read, write).
• GPIO pin triggering.
• Sleep functionality to delay GPIO operations.

These changes will enhance the capability of SplashKit for hardware-level control, especially in embedded systems and Raspberry Pi applications.

Type of change:

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?:
The new GPIO functions were tested by running:

cmake .
make

in the /splashkit-core/projects/cmake directory, followed by performing unit tests to ensure proper functionality.

Testing Checklist:

• Tested with skunit_tests
• Validated that the functions work on Raspberry Pi for GPIO control and I2C communication.

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• My changes generate no new warnings.
• I have ensured that the new functionality integrates well with existing SplashKit features.

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This PR adds important GPIO features to SplashKit, providing users with enhanced capabilities for controlling Raspberry Pi hardware. Please review the changes and provide feedback. Thank you!