Gizmo line styles

[lynn-lumen]

Objective

• Adds line styles to bevy gizmos, suggestion of Tracking issue: Amazing Gizmos #9400
• Currently solid and dotted lines are implemented but this can easily be extended to support dashed lines as well if that is wanted.

Solution

• Adds the enum GizmoLineStyle and uses it in each GizmoConfig to configure the style of the line.
• Each "dot" in a dotted line has the same width and height as the line_width of the corresponding line.

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Changelog

• Added GizmoLineStyle to bevy_gizmos
• Added a line_style: GizmoLineStyle attribute to GizmoConfig
• Updated the lines.wgsl shader and the pipelines accordingly.

Migration Guide

• Any manually created GizmoConfig must now include the line_style attribute

Additional information

Some pretty pictures :)

This is the 3d_gizmos example with/without line_perspective:

And the 2d example:

[pablo-lua]

At this point I think we should break gizmos 2d_example and 3d_example in a few parts, the examples are getting pretty cramped

[lynn-lumen]

At this point I think we should break gizmos 2d_example and 3d_example in a few parts, the examples are getting pretty cramped

I agree but I think this should wait until both #12252 and this are merged so we can have one "fancy_gizmos" example.

[pablo-lua]

All good. The problem with examples being too big can be in another PR.

[BD103]

Looks good and tested, though take my review with a grain of salt. I have little experience with gizmos or shaders. 😅

[alice-i-cecile]

Thank you to everyone involved with the authoring or reviewing of this PR! This work is relatively important and needs release notes! Head over to bevyengine/bevy-website#1290 if you'd like to help out.