feat(CCHAIN-1193): Malicious node -- produce equivocations

[sergio-mena]

Closes: #1518

This PR introduces all kinds of equivocation. The behavior is hidden behind environment variable TEST_ONLY_MALICIOUS_NODE. This should NEVER be set in production.

The effect of this change is to produce all three types of equivocation in the network, where we can observe them in the logs, and RPC methods.

This PR will be reverted once the needed data has been produced on devnet

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[github-actions]

Hi @sergio-mena,

Thank you for your interest in contributing to Malachite.

This PR has been automatically closed because it does not reference a GitHub issue. All PRs must reference an existing issue using the format Closes: #XXX.

To contribute properly:

1. Find an existing issue you'd like to work on, or open a new issue describing your proposed change
2. Comment on the issue requesting assignment and wait for maintainer approval
3. Only submit a PR after you have been assigned to the issue

Please see our CONTRIBUTING.md for more details.

[github-actions]

Hi @sergio-mena,

Thank you for your interest in contributing to Malachite.

This PR has been automatically closed because you are not assigned to issue #1518. We require contributors to be explicitly assigned to an issue before submitting a PR.

To contribute properly:

1. Comment on issue Equivocating node #1518 requesting assignment
2. Wait for maintainer approval
3. Only submit a PR after you have been assigned

Please see our CONTRIBUTING.md for more details.