Improve user friendliness of the output of the @show of the energy_problem

[datejada]

What and Why

Fix significant digits and units in the timing and objective function.

Format the values of the timing and objective function

• objective function: Plain format (no scientific format). Instead of 3.35e3, it should be 3350
• timing: do not show "(in seconds)" -> format it to have in the meaningful format, e.g., 17ms

Possible Drawbacks

No response

Related Issues

No response