[Feature request]: Timing info per tile, and other debug metrics

[scottstanie]

I've been thinking about what possible metrics would be easy to track for benchmarking/debugging unwrapping.

• One basic nice-to-have: printing the time taken per tile along with the tile position. This could be useful to plot after to see if one single area took up all the time, or if it was the coarse unwrapping which took the longest.
• Even though some unwrappers make it difficult to track stuff about the internals while they're running (e.g. snaphu), perhaps we could set up something to watch the processes as they run. My first attempt in dolphin is the CPURecorder class that I started to get basic benchmark info for different workflow stages. The code is very open to changes/reworks.