Make task stats take less memory by default (#2765)
* Make task stats take less memory by default
* Swap order of condition operands
* TaskStats -> ExportedTaskStats
* Add full stats disclaimers
* Clippy
* Fix duplicate labels
* Move stats type reporting to TurboTasks
* Fix turbotrace and turbopack visualization
* Store last duration and execution as SmallDurations
Co-authored-by: Tobias Koppers <tobias.koppers@googlemail.com>
