Enhancement/axis wise bounds NumberNode #471
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Data is stored at C++ level with the class `AxisBoundInfo` as private attribute to `NumberNode`. Added relevant C++ tests.
For each bound axis and each hyperslice along said axis, we store the running sum of the values within the hyperslice. This state dependant data is stored via `NumberNodeStateData`. If `NumberNode` is initialized with values, we check that all axis-wise bounds are satisfied.
Added satisfies_axis_wise_bounds(), update_bound_axis_slice_sums(), axis_wise_bounds(), and bound_axis_sums() to NumberNode. Updated various NumberNode, IntegerNode, and BinaryNode methods to reference NumberNodeStateData as opposed to ArrayNodeStateData. Updated all NumberNode mutate methods to reflect changes to the axis-wise bound running sums. Added C++ tests to check said mutate methods on BinaryNode and IntegerNode.
Make use of BufferIterators to compute the sum of the values within each hyperslice along each bound axis as opposed making a custom method to do this.
Defined method to initialize_state() given exactly one axis-wise bound. Fill state with lower bounds and increment until state satisfies axis-wise bounds or determines infeasible. Added appropriate C++ IntegerNode and BinaryNode tests.
Made BoundAxisInfo and BoundAxisOperators members of NumberNode. Updated all C++ tests. Optimized BufferIterator use in initialize_state().
Improved comments. Improved methods. Cleaned up C++ tests. Added static_casts where necessary for CircleCI.
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Do not merge. Draft PR. Only C++ has been implemented. Simply checking CircleCi.