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Change the default matmul precision in JAX to highest precision.
On CPU and GPU, this change has no effect. On TPU, this PR changes the default matmul algorithm from a fast, low-quality algorithm to a slower, high-precision algorithm that uses multiple passes. Many users have reported the low-quality-by-default behavior to be a footgun, especially when performing non-neural network computations. The old behavior can be restored either by passing an explicit Precision option to operators such as `dot`, or by changing the default precision, e.g., jax.config.update('jax_default_matmul_precision', 'fastest') #7010 PiperOrigin-RevId: 395549544
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