Feature rootchain dev clique

[ferranbt]

Description

This PR replaces the consensus protocol of the debug rootchain server and uses Clique instead of the Dev mode. This is necessary if we want to enable premined accounts in a custom genesis file, which is not possible in Dev.

Changes include

• [ ] Bugfix (non-breaking change that solves an issue)
• [ ] Hotfix (change that solves an urgent issue, and requires immediate attention)
• [ ] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (change that is not backwards-compatible and/or changes current functionality)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it

Checklist

• [ ] I have assigned this PR to myself
• [ ] I have added at least 1 reviewer
• [ ] I have added the relevant labels
• [ ] I have updated the official documentation
• [ ] I have added sufficient documentation in code

Testing

• [ ] I have tested this code with the official test suite
• [ ] I have tested this code manually

Manual tests

Please complete this section if you ran manual tests for this functionality, otherwise delete it

Documentation update

Please link the documentation update PR in this section if it's present, otherwise delete it

Additional comments

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[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (feature/v3-parity@16463dd). Click here to learn what that means. The diff coverage is n/a.

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