- moved debugger related files to a dedicated directory
- trace provider now allows to read all timelines associated to a given state tree asset instance
- added multiple slate widgets to manage tracks and timelines (directly inspired from RewindDebugger to make it easier to integrate the tools together eventually).
- added synchronized lists of instance names and timelines
- converted EStateTreeUpdatePhase to enum flags used to build frame details hierarchically
#preflight 645a57584c3ec54e6e65f494
[CL 25390252 by yoan stamant in ue5-main branch]
