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perf: make ast fields optional instead of null
With esTreeNode, optional branches of the AST are represented by explicit null values, and this was reflected in the Rollup AST nodes as well since we copy these null values from the esTreeNode to the Rollup AST node during parseNode. This is potentially memory inefficient as nodes frequent optional fields will take up 4 bytes of memory on each instance of that node. In comparison, if we can avoid setting these values at all on our nodes, we can save some additional memory. This has the potential to create more hidden classes as each variation of the node will have a different set of properties, but performance does not really appear to regress much from what I can tell.
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