Addition of the Triple Handle Controller plugin for continuous, three-dimensional affective ratings

[caluap]

Hi all, this PR introduces the triple-handle controller plugin, enabling continuous three-dimensional affective ratings (e.g., valence, arousal, dominance) in jsPsych experiments. It lets participants adjust three separate handles in real time, providing dynamic affective data during stimulus presentation.

Included:

• Plugin code
• README
• package.json
• Extras: /docs with documentation, /examples with a working demo, and a test suite.

How to verify:

You will need a handle controller. We developed and tested the plugin using a Logitech Flight Throttle Quadrant.

• Try the Demo: Open the provided example file and interact with the three handles to see real-time ratings.
• Check Data: Inspect the console or saved data to confirm that ratings and timestamps are recorded as expected.

Feedback is welcome, especially on code clarity and documentation. Thanks for reviewing!

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