Particle filters in OpenPMD

[MaxThevenet]

The AMReX writer functions for the plotfile format take a particle filter, i.e., a lambda function that is evaluated on each particle and returns 0 (do not dump this particle) or 1 (dump this particle).

Class ParticleDiag holds the the general properties of these filters (provided by the user), and the filters are constructed in FlushFormatPlotfile::WriteParticles, and a lambda function containing all these filters is passed to amrex::ParticleContainer::WritePlotFile.

It would be useful to have this feature working for OpenPMD output.

[ax3l]

Memo to myself - see signatures of:

• WarpXOpenPMDPlot::DumpToFile
• amrex::ParticleContainer<...>::WritePlotFile