Add halide_host_cpu_count() to public API #8691
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We have some uses where we want to share the Halide threadpool with non-Halide code; in those cases, it is useful to have this function available to know what Halide's default parallelism would be. In general, since all of our default parallel runtimes use this function, it seems no issue to expose it via the runtime.
I made sure the description was specific about "logical" cores, but let me know if there's better language to use here.