Improved the grid by removing intersection artifacts

[SarthakSingh31]

Improved the grid that is rendered by removing artifacts that are generated when lines with different colors intersect.
Switched to using alpha blending in a hierarchical order to achieve perfect looking intersections.

Before (render time: 0.26ms):

After (render time: 0.33ms):

Sorry about the random rustfmt changes.

[fslabs-bot]

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[fslabs-bot]

Welcome @SarthakSingh31! It looks like this is your first PR to ForesightMiningSoftwareCorporation/bevy_infinite_grid 🎉

[IceSentry]

Hey, thank you for the PR, could you remove all the files that are unrelated to the PR? I think only the shader needs to change. All the other rust files seem unrelated.

I never noticed those artifacts before, but now I can't unsee them so I do want to merge this.

[SarthakSingh31]

@IceSentry remove the other changes. It only has the shader changes now.

[IceSentry]

Thank you!