[Impeller] cache descriptor set layouts.#57103

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jonahwilliams wants to merge 2 commits intoflutter:mainfrom jonahwilliams:desc_pool_stuff

+126-153

Commits on Dec 10, 2024

[Impeller] cache descriptor set layouts.
jonahwilliams
committed

Commits on Dec 11, 2024

fix unit tests.
jonahwilliams
committed