Feature request: diagnostic tools for evaluating quality of graph matching

[ebridge2]

Is your feature request related to a problem? Please describe.

For networks with a known correspondance, a match ratio can be constructed; e.g., where P is the correct permutation matrix and Pu is the calculated permutation matrix, just sum the number of times the diagonal of PPu = 1.

[bdpedigo]

I have a bunch of code for this and other diagnostics, down to add them after https://github.com/microsoft/graspologic/pull/960 is approved