Allow user output at specific turn numbers

[cemitch99]

trafficstars

To avoid large output to h5 files and long processing times, it would be good to allow the user to specify at a monitor specific turn indices, or a range of turn indices, at which output is produced.

[ax3l]

I'll move the WarpX "Intervals Parser" to ABLASTR so we can reuse this in ImpactX. https://warpx.readthedocs.io/en/latest/usage/parameters.html#intervals-parser

We can target this for 24.10 since the WarpX/ABLASTR release for 24.09 is alread out.

[ax3l]

First implementation in #713 for our 24.10 release.