Support NUMBA_NUM_THREADS env variable
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Description
According to [Avoid Oversubscribing Threads](https://docs.dask.org/en/latest/array-best-practices.html#avoid-oversubscribing-threads), you set OMP_NUM_THREADS, MKL_NUM_THREADS, and OPENBLAS_NUM_THREADS.
You should also set NUMBA_NUM_THREADS and maybe more: https://github.com/joblib/joblib/blob/ed0806a497268005ad7dad30f79e1d563927d7c6/joblib/_parallel_backends.py#L59-L67
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