Split a ResizeArray into an array of smaller chunks. This requires `items/chunkSize` Array copies of length `chunkSize` if `items/chunkSize % 0 = 0`, otherwise `items/chunkSize + 1` Array copies.

Split a large ResizeArray into a series of array chunks that are each under the Large Object Heap limit. This is done to help prevent a stop-the-world collection of the single large array, instead allowing for a greater probability of smaller collections. Stop-the-world is still possible, just less likely.