feat: add bool wf relation#1639
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This adds WellFoundedRelation for Bool '<' and '>'. I found myself wanting to use this when implementing the finiteness relation for the scan combinator, but it doesn't exist outside mathlib. Mathlib has 'WellFoundedLT' and 'WellFoundedGT' for this. I elected not to try to upstream all of that infrastructure and just provide these definitions in terms of WellFoundedRelation.
@kim-em suggested I make this PR on Zulip