Add support for SIMULATION output (per time period/iteration) such as gaps and computation times for easy post simulation analysis

[MarkRaadsen]

add in memory model + then implement for the various other repository implementations (CSV, memory etc.).

Main reason for this is to have some stats per iteration that can easily be digested in Excel or Python without having to sift through the logs

Start with adding:
iteration gap
iteration computation time

[MarkRaadsen]

• iteration index not yet supported for simulation
• only planit csv supported for simulation
• check if works for traditional static
• check if works for sLTM
• implement for memory output
• allow for simulation results to be persisted each iteration (configure per output type)
• allow for simulation data to be consolidated into a single file, i.e., gather all results in memory and write out after finalising the simulation instead of per iteration
• Add #paths added as option + num added/removed
• Add runtime - for sLTM per iteration

[MarkRaadsen]

#122 consolidated simulation data draft implemented for PLANitOutputFormatter

[MarkRaadsen]

• implement for TNTP output
• add support for traditional static assignment for relevant simulation data output
• add smoothing step size as option to persist for simulation data
• make sure convergence gap that is persisted has higher precision than regular floating point results