Add a Bitmap in Ethereum to disable verifiers

[MauroToscano]

• [ ] Add a bitmap in Ethereum to disable verifiers in the ServiceManager. Start in 0 when no verifier is disabled
• [ ] Add a method to update it with the admin sig. Make sure it's easy to use.
• [ ] Make the operators fetch the last bitmap before resolving the task, if it's blacklisted, assume the proof is false.
• [ ] Make the same logic in the Batcher