Sort by Closest Match by Terms

Add a new sorting option so that you can sort the list of content by the closest match determined by the number of terms in common. For example:

node/1 has terms dog, cat, frog, duck, goose, fish
node/2 has terms dog, cat, goose, fish, mouse, crocodile
node/3 has terms frog, goose, fish, alligator
node/4 has terms dog, cat, frog, duck, goose, fish, alligator
node/5 has terms alligator, crocodile, mouse

If we are viewing node/1 and want to show a list of content that is sorted by closest match (by terms), then we would show:

node/4
node/2
node/3
node/5