Float4 arrayView support

[rbrchen]

Preliminary Float4 support for arrayViews. Currently only supported for F32ArrayPadded buffers, which can be accessed like a Float4[] as shown below:

Float4[] arr = buffer.float4ArrayView(); // for a F32ArrayPadded buffer

At the moment, to use an element in the array, the Float4 must be loaded into a separate variable first, i.e.

Float4 a = arr[index * 4];

A value can be stored into the array through the following syntax:

arr[index * 4] = ...

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Progress

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@rbrchen This change now passes all automated pre-integration checks.

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Float4 arrayView support

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[jjfumero]

This is great work. I have a few comments/questions.

All test passing also for my setup (OpenCL backend).

[mlbridge]

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