How to "ping" an arrow

I would love to have a short ping in my arrow. The Animation would first ```.set_color(ping)``` and after that ```.set_color(original)```. I have discoverd how to use ```FadeToColor``` however only sets the color from the top and not along the stem of the arrow.

Is there any way for me to let the color fade from the bottom of the stem or not?

Look at the Arrow class in manim/mobject/geometry/line.py to understand how color is applied. Investigate the set_color method and the FadeToColor animation. The goal is to create a new animation that changes color along the arrow's stem, perhaps by modifying the shader or using a gradient. Test by creating a simple scene with an arrow and trying to apply the new effect.

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