ggml webgpu: faster normal quant and some k-quant matrix operations, better shader...

ggml webgpu: faster normal quant and some k-quant matrix operations, better shader parameter handling (#20173)

* K quant speedup (#20)

* Basic JIT compilation for mul_mat, get_rows, and scale (#17)

* scale jit working

* preliminary working jit for getrows and mulmat, needs refining

* simplified mul_mat preprocessing switch statement

* get_rows fixes, mul_mat refinement

* formatted + last edits

* removed some extraneous prints

* fixed get_rows, fixed workgroup dispatch in mul_mat. no gibberish

* small fix

* some changes, working

* get_rows and mul_mat jit fixed and working

* Update formatting

* formatting

* Add header

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Co-authored-by: Neha Abbas <redacted>
Co-authored-by: Reese Levine <redacted>
* Start work on all-encompassing shader library

* refactor argmax, set_rows

* Refactor all but flashattention, mat mul

* no gibberish, all k quants added, merged

* vec memory fix

* q6_k matching metal on my machine, tests passing

* Set tile size for q6_k separately

* Separate out fast shaders

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Co-authored-by: neha-ha <redacted>
* Move towards writeBuffer for params

* Move away from multiple buffers for set_rows errors, remove host buffer for parameter buffers, minor cleanups

* Remove extra file

* Formatting

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Co-authored-by: neha-ha <redacted>