* Use uint64 as trace index

* Return new Position object when attacking & defending

* Use the new API with the solver

feat(op-challenger): AlphabetProvider + Naive Solver

op-challenger: Add Responder interface

tests.

cannon: Remove unicorn references

require fee increase & gas re-estimation for retried transactions

[proxyd] do not block auth rpc call when auth is not enabled

fix(ctb): Update Bytes Test Styling

standard.

chore(ctb): Update `dispute` contracts' comment style

Co-authored-by: refcell.eth <abigger87@gmail.com>

Co-authored-by: refcell.eth <abigger87@gmail.com>

Co-authored-by: refcell.eth <abigger87@gmail.com>

Co-authored-by: refcell.eth <abigger87@gmail.com>

Co-authored-by: refcell.eth <abigger87@gmail.com>

chore(ctb): `LibPosition` documentation, tests, perf

feat(ctb): Alphabet `step` function in `FaultDisputeGame`

Co-authored-by: refcell.eth <abigger87@gmail.com>

gas snapshot