feat: add ip adapter benchmark

[sayakpaul]

What does this PR do?

Since IP Adapters very popular, it makes sense to have a benchmark for it.

To test in isolation:

python benchmark_ip_adapters.py && \
  python benchmark_ip_adapters.py --run_compile &&  \
  python benchmark_ip_adapters.py --ckpt=stabilityai/stable-diffusion-xl-base-1.0 && \
  python benchmark_ip_adapters.py --ckpt=stabilityai/stable-diffusion-xl-base-1.0 --run_compile

[HuggingFaceDocBuilderDev]

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[yiyixuxu]

thanks!

[yiyixuxu]

cc @DN6 for awareness :)