Add memory usage info reduced diagnostic

[n01r]

This PR adds a new reduced diagnostic that uses AMReX's PrintUsageToFiles and produces a text file for each rank with detailed memory usage information.

A demonstration of the new diagnostic was added to the laser-ion acceleration example, where it can become helpful in debugging given that the computational load imbalance is high and on larger production cases one might see local out-of-memory errors.

The output looks like this, e.g. in MPR.0 from the laser-ion example

Memory usage at step 0, time = 0.00000000000000e+00
    Total GPU global memory (MB): 7966
    Free  GPU global memory (MB): 1571
    [The         Arena] space allocated (MB): 2987
    [The         Arena] space used      (MB): 53
    [The         Arena]: 1 allocs, 261 busy blocks, 2 free blocks
    [The Managed Arena] space allocated (MB): 8
    [The Managed Arena] space used      (MB): 0
    [The Managed Arena]: 1 allocs, 0 busy blocks, 1 free blocks
    [The  Pinned Arena] space allocated (MB): 24
    [The  Pinned Arena] space used      (MB): 0
    [The  Pinned Arena]: 3 allocs, 64 busy blocks, 6 free blocks