* op-challenger: Remove dependency from config to flags.

Now all CLI logic is encapsulated in cmd and flags module, with config and fault modules being focussed on business logic.

* op-challenger: Move shared types into a types module

Makes it much simpler to avoid dependency cycles by having core type definitions in a different module to the service wiring code that creates everything.

* op-e2e: Update for new challenger modules.

* op-challenger: Modify solver tests to not be dependent on implementation details of alphabet provider.

Introduces the ClaimBuilder test utility to make creating claims in various situations easier and reduce duplication.

* Fix merge issues

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