[CMSIS-NN] Global function that provides range based on dtype #13652
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Follow up from #13522 (comment).
Range for dtype was being sought differently from inside various CMSIS-NN tests. This commit provides
a common global function inside aot.py under tvm.testing that can provide (min, max) values based on the dtype.
In future, other AOT based targets can make use of this function to obtain the range.
cc @Mousius @lhutton1 @NicolaLancellotti