Wrong name of body tracking 34 joint (naval->navel)

[StephanHasler]

Preliminary Checks

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• This issue is not a question, bug report, or anything other than a feature request directly related to this project.

Proposal

I think the joint BODY_34_PARTS.NAVAL_SPINE should be named NAVEL_SPINE.
I stumbled about this when switching from an Azure Kinect to the ZED camera. Both provide a very similar body tracking model. Only that for the Azure the joint is called NAVEL_SPINE while the ZED calls it NAVAL_SPINE.
This makes it hard for me to write camera-agnostic downstream code.

Use-Case

No response

Anything else?

No response