ViewComponent: convert _gl_toggle

What does this MR do and why?

This introduces ViewComponent into the codebase as a way to organize reusable frontend code in the backend.

As example usage, I'm converting _gl_toggle to its own component.

What I did was basically follow https://viewcomponent.org/guide/getting-started.html and move a move/adapt the code from the previous partial to the component view

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.