New features 1.2 release

[leey611]

https://github.com/ml5js/ml5-website-v02-docsify/issues/193 https://github.com/ml5js/ml5-next-gen/releases/tag/v.1.2.0

• add FaceMesh.getTriangles function and example
• add bodySegmentation.getPartsId()
• add FaceMesh's getConnections and getUVCoords functions and examples
• add HandPose's getConnections function and example
• add BodyPose's getConnections function and example

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[alanvww]

@MOQN Hi Moon! Please review this PR when you have time :D

[MOQN]

@leey611 @alanvww I just had a chance to look at the updates. They are amazing, thank you!