Add TableDataSavingCallback

[LasNikas]

This is to save table data only for a specific time range save_interval.
The rows in the table are the function values and the columns are the evaluations.

hydrostatic_water_column_2d.jl with the following extra_callback

interpolated_density(v, u, t, system) = nothing
function interpolated_density(v, u, t, system::TrixiParticles.FluidSystem)
    n_particles_xy = round(Int, 1.0 / system.initial_condition.particle_spacing)

    values = interpolate_line([0.5, 0.0], [0.5, 1.0], n_particles_xy, semi, system,
                              v, u; endpoint=true, cut_off_bnd=true)

    return values.density
end

pos = collect(LinRange(0.0, 1.0, round(Int, 1.0 / fluid_particle_spacing)))

extra_callback = TableDataSavingCallback(; dt=0.02, save_interval=10, 
                                         start_at=0.90, # condition is `true` if `t >= start_at` 
                                         axis_ticks=Dict(interpolated_density => pos),
                                         interpolated_density=interpolated_density)

The plot shows the density evaluated at every dt starting at time t=0.9

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 106 lines in your changes missing coverage. Please review.

Project coverage is 68.52%. Comparing base (c565f67) to head (6bb8c9e).

Files	Patch %	Lines
src/callbacks/data_saving.jl	0.00%	104 Missing ⚠️
src/callbacks/post_process.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #602      +/-   ##
==========================================
- Coverage   69.92%   68.52%   -1.40%     
==========================================
  Files          86       87       +1     
  Lines        5120     5224     +104     
==========================================
  Hits         3580     3580              
- Misses       1540     1644     +104     

Flag	Coverage Δ
unit	68.52% <0.00%> (-1.40%)	⬇️

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