* op-challenger: Support loading json or binary cannon states.

* op-challenger: Use binary cannon snapshots

* op-challenger: Support downloading prestates in multiple formats.

* op-challenger: Verify newly downloaded snapshots.

* op-e2e: Update test to handle binary snapshots correctly.

* op-e2e: Remove unused parameter

* op-challenger: Add more varied data to the test cannon state.

* op-challenger: Add more varied data to the test cannon state.