Display current simulation status

[sriharshakandala]

Display current simulation status at a user prescribed frequency from the root process.
To start with, this could contain basic information like # of time steps simulated, total # of time steps, elapsed wall clock time and a timestamp at the time of print out.
This will help the user understand how far the simulation has progressed.
This could be expanded to contain more useful information like CFL max in the domain, macro information like integrals of density, energy, momentum, etc.

cc: @szy21 , @akshaysridhar

[akshaysridhar]

Thanks @sriharshakandala:

In previous iterations of ClimateMachine we had something like

        """
        Update
            simtime = %s
            wallclock = %s
            efficiency (simtime / wallclock) = %s
            wallclock end (estimated) = %s
            norm(Q) = %.16e""",

a SummaryLogCallback : https://github.com/CliMA/ClimateMachine.jl/blob/2e0b6b7d97719e410d12a8596c98d5db7f891dbf/src/Driver/Callbacks/Callbacks.jl#L51C55-L51C55

and additional callbacks that check_cons (check conservation), monitor_courant (monitor courant numbers)

================================================
                Courant numbers at simtime: %8.2f
                Δt = %8.2f s
                ------------------------------------------------
                Acoustic (vertical) Courant number    = %.2g
                Acoustic (horizontal) Courant number  = %.2g
                ------------------------------------------------
                Advection (vertical) Courant number   = %.2g
                Advection (horizontal) Courant number = %.2g
                ------------------------------------------------
                Diffusion (vertical) Courant number   = %.2g
                Diffusion (horizontal) Courant number = %.2g
                ================================================

and a more involved StateCheck Callback option as in https://github.com/CliMA/ClimateMachine.jl/blob/2e0b6b7d97719e410d12a8596c98d5db7f891dbf/src/Diagnostics/Debug/StateCheck.jl#L119

I guess the intended display statement here incorporates some combination of these?

[Sbozzolo]

This was implemented in #2428