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[Impeller] Add a note about Graphite to the FAQ. (flutter/engine#54623)

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Action item from go/impeller-faq-followups.
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@ -275,3 +275,21 @@ the name seemed apt. It's also an internal component and perhaps 30 seconds were
spent thinking of a name.
Why Flutter's compositor is called "flow" is left as an exercise to the reader.
### How does Graphite (a new GPU backend for Skia) relate to Impeller?
Graphite is a new backend the Skia team is building to replace its legacy
renderer (called Ganesh).
Similar to Impeller, Graphite is designed to be optimized for modern GPU APIs
(e.g Metal, Vulkan, Dawn). It aims to reduce the CPU cost of recording commands
while taking advantage of newer GPU features.
One of the goals of Graphite is to allow for easier pre-compilation of shaders
at startup time. But it still aims to support Skia’s general 2D API and has the
same spec. requirements. The design decisions made to support those requirements
make offline shader compilation impossible.
As of August 2024, Flutter has no plans to use Graphite. However, we, the
Flutter team, are in constant communication with the Skia team and freely share
insights and ideas across Impeller and Graphite.