Include optimisation step in dump file name

**Is your feature request related to a problem? Please describe.**
Currently the dump trajectories and observables are time stamped. The refinement output does not include time stamps, but uses refinement steps instead. It becomes difficult to match a specific dump file to its correct parameters and FoM value.

**Describe the solution you'd like**
Include the refinement step in the file name.
Optionally, add parameters and FoM to the dump files as metadata or attributes.

**Describe alternatives you've considered**
N/A

**Additional context**
N/A