feature: WebGPU shader builder for Vis Core [DC-9506]

[Jarbuckle]

feature: WebGPU rendering pipeline for Vis Core [[DC-9506]]

What

Follow-on from an earlier (now closed) PR: #256

That PR was a combination of different work, so the goal with this PR is to have it focused just on the WebGPU rendering pipeline, specifically the first implemented piece of that pipeline: the programmatic creation of shaders.

How

• Created a new webgpu folder within core
• Moved over the baseline shader builder functionality from the preceding PR
• Closed the preceding PR (its other changes were inherited from work Noah's doing in another PR)
• Made some adjustments to respond to feedback provided on the preceding PR (specifically: removed the usage of classes when defining shaders, and made StructDeclarations into valid values for most type fields -- more changes forthcoming!)

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