[Feat]: XDMF files time-aware

[Grenier]

What do you want?

XDMF files can carry time information (under Time node).
This feature can help Paraview to synchronize files with different time recording.

A possible usage

No response

A possible implementation

The following lines can be added to lines 657 and 688 of hdf5.hpp:

auto time                      = grid.append_child("Time");
time.append_attribute("Value") = t;

The question is: how to pass time value t with respect to other arguments (optional or not) of save_field?

Other informations

No response

Code of Conduct

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