[WIP][webgpu] Apply dp4a for generation shader #23585
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Description
This pr applies DP4A to generation shader. It uses similar ideas compared with previous generation shader, but different data types.
In easy mode: NV 42 tokens/s -> 45 tokens/s, Meteor Lake 19 tokens/s -> 20 tokens/s
Without this PR
NV
Meteor Lake
With this PR
NV
Meteor Lake