Adding routing struggle metric

[amin1377]

WIP

[amin1377]

Agilex-like-Koios_medium: Link
SIV-titan_other: Link
SIV-titan_quick_qor: Link
S10-titanium: Link
Flagship-VTR (relaxed chan width): Link
7-series - VTR: Link

[amin1377]

@vaughnbetz: I’ve included the results for various architectures and benchmarks. For most circuits, the routing struggle is zero, likely because, unlike in the paper, the utilization isn’t as high and there are ample routing resources available. Therefore, for the benchmarks included, this metric might not be particularly informative.

However, I did test it on some architectures and circuits where the router struggled with congestion, and in those cases, the routing struggle metric was above 20% (as mentioned in the paper). I don’t have a strong preference about whether to include this metric or not; I just thought it might be interesting to have a metric that allows us to compare how difficult routing was across different architectures and circuits.