Switch to differentiable head, larger input sequence (#489)

* Switch to differentiable head, larger input sequence

* change calibration ds; shorten quantization code

* generate notebook outputs

* Updated plots

* minor

* set CPU freq. governor to 'performance'; vertical throughput arrow

* bf16 and fp32 baselines

* IPEX+TS+AMX Working

* results with "powersave" setting

* results with governor="perf"

* remove ipex-fp32 results

* clear fp32 output

* restore `bge-small (transformers)` output

* move `generate_random_sequences` out of `PerformanceBenchmark`

* Fix typo at the end

* Final touches to throughput plot

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Co-authored-by: Tom Aarsen <[email protected]>