feat(flame_3d): Allow shader uniform structures use array elements

[wolfenrain]

Description

Added support for array elements in shaders, which allows us to simplify our light system and joint logic

Checklist

• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

[luanpotter]

This is an amazing step forward!
I'd love to support these though:

• arrays of structs - I didn't recall seeing anything on spec that says it wouldn't work (but it didn't)
• arbitrary length arrays with SSBOs
  the 16 joint limit can be quite limiting even with my per-node optmization

[wolfenrain]

This is an amazing step forward! I'd love to support these though:

• arrays of structs - I didn't recall seeing anything on spec that says it wouldn't work (but it didn't)
• arbitrary length arrays with SSBOs
  the 16 joint limit can be quite limiting even with my per-node optmization

I kept the implementation the same and we can explore arbitrary length SSBOs later, there was a limit on uniforms that we should get verified to make sure if we can or can not increase the joint limit