[ET-VK] Add Fusing for Conv/Binary Ops, Clamp/Binary Ops, and Clamp/Clamp

[alexdean08]

With the motivation of improving performance, this change adds the functionality for fusing the following ops:

• conv2d PW s1p0 and binary ops (add, sub, mul, div)
• clamp and binary ops (add, sub, mul, div)
• clamp and clamp

cc @SS-JIA @manuelcandales @cbilgin

[pytorch-bot]

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• Test CUDA Builds / test-executorch-cuda-build-12.8 / linux-job (gh)
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