feat: implement proof of concept animated gizmos

[RobWalt]

Objective

• This is a new attempt to implement animated gizmos
• This PR is supposed to supersede my first try here Animated gizmos #14645
• This is still a proof of concept of a second approach of tackling the issue. I generally would like to have a discussion here to decide whether to use the old approach from the PR mentioned above or the new approach sketched in the first commits here

Solution

There are generally two approaches I have considered: The old one, which is CPU based and the new one which is GPU based.

Old solution

• This old solution would basically replicate the existing API for the animated versions of it
• Lot's of code would be reused
• The implementation would happen in the rust code

New solution

• The implementation is based on modifying the gizmo shader directly
• There are just some new variants on the gizmo line style enum
• This introduces a bit more uniform data to the shader (everything time based, we could probably make that cleaner, the current version is just a proof of concept).
• Also the time uniforms need to be constantly updated
• Unfortunately I've noticed that the lines are rough around the edges ... literally. For curved lines the shader approach seems to be suboptimal as it will produce dashes of varying lengths. This is probably caused from the way we use small lines to draw curved lines.

Testing

• You can try to run the new version of animated gizmos via the 2D gizmos example

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Showcase

TODO

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[RobWalt]

Here's a gif of the current state with a huge speed factor so that the effect is visible. I think generally speaking, the line shader is a bit cursed, since:

1. The dash length varies. That's also the case in the non-animated case if you look closely
2. The speed of the dashed line varies (based on length? idk)

[RobWalt]

Kooha-2025-04-28-19-53-21.webm