feat: sparse representation for empty columns - #2171
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This updates the way data is stored within the trace columns by introducing a sparse representation for padding. Specifically, each column now maintains a "start" position which identifies where the real trace begins, and padding ends. Also, this adds support for columns which are all a single constant (excluding padding). In addition, this refactors the trace implementation itself to remove unnecessary interfaces, and provide a clean and immutable notion of trace. This required separating out the notion of trace builder from the final trace itself. Specifically, a MutArray now only supports Append() for adding more rows. Finally, the updates the trace stats reporting. NOTE: a key outstand cause of memory inefficiency currently lies with the memory log itself. This will need to be optimised sensibly in order to manage overall memory requirements. Signed-off-by: DavePearce <dave01001110@gmail.com>
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