Reject future blocks

[Nemanja0x]

Description

The PR add validations for header in validationHeaderFields. Changes includes check for future block, which includes checking if the timestamp is within predefined time slot of time.Now().UTC().Unix(). If not, we assume that it is a future block and reject it.

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

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Documentation update

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Additional comments

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[goran-ethernal]

I think we should add a flag to the genesis command as well. Even though we will have this parameter as a part of on-chain governance soon, for the first start of the chain, we need to specify it in the genesis.

[Stefan-Ethernal]

Agree with @goran-ethernal and @stana-miric:

• BlockTimeDrift should be uint64, and
• a flag should be exposed in the genesis command in order to configure it initially.

Also, 2 out of 3 tests in the TestE2E_Consensus_Basic_WithNonValidators test are failing (the ones which are restarting nodes and letting them sync). I haven't realized why exactly, but have seen this error message in basically all of the validator nodes:

2023-05-17T09:29:38.694Z [DEBUG] polygon.server.polybft.consensus_runtime: HasQuorum has been called but proposer could not be retrieved: error="get latest proposer not found - height: 14, round: 3, pc height: 14, pc round: 0"