[xegpu] Remove grid search and genetic algorithm matmul tuners#198
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tune_costmodel.pyis refactored to have a more genericoptimize_payloadentry point.tune_matmul_gridsearch.py,tune_matmul_ga.py,genetic_algorithm.py.Grid search tuning has now become infeasible due to larger number of tunable parameters. The genetic algorithm tuner is now superseded by the cost model based tuning. This cleanup reduces the amount of code to maintain.
The motivation for the cost model refactoring is the upcoming KernelBench driver which can tune gemm-like kernels at runtime.