Replace actualConfiguration with consensus configuration: [ECR-3612]

[dmitry-timofeev]

Overview

Provide access to consensus configuration instead of all configuration
according with the changes in core.

Remove the Java types representing the consensus configuration
in favour of the generated protobuf messages.

---

See: https://jira.bf.local/browse/ECR-3612

Definition of Done

• There are no TODOs left in the code
• Change is covered by automated tests
• The coding guidelines are followed
• Public API has Javadoc
• Method preconditions are checked and documented in the Javadoc of the method
• Changelog is updated if needed (in case of notable or breaking changes)
• The continuous integration build passes

[coveralls]

Coverage decreased (-0.1%) to 85.819% when pulling e4dca44 on dmitry-timofeev:add-consensus-config-ECR-3612 into 655eb58 on exonum:dynamic-services.

[MakarovS]

👍