Make the compute mesh example easier to understand and modify.

[ivanceras]

Objective

• Make the compute mesh more hack-able and easier to modify.

Solution

• Remove the use of non-intuitive numbers such as 192 which is the total number of f32 in the vertices data. Instead we use the VERTEX_COUNT (24 in this case) to assemble the vertex data elements inside the loop. The array of 8 element of f32 becomes an inner loop inside of the main loop, which makes a total of 192 iteration matching the original algorithm.
• Decouple the normals and uvs from the combined vertex data in vertices to make it more flexible to add or remove attributes in the vertex data of a mesh.

Testing

• The output compute_mesh example stays the same as the previous code.

• Are there any parts that need more testing?

• Perhaps experimenting with custom mesh attributes and use it in the compute_mesh shader.

• How can other people (reviewers) test your changes? Is there anything specific they need to know?

• Pull this PR and run the compute_mesh example. It should be running the same as before.

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