Update KIP-249: Add malicious proposer detection

[hyeonLewis]

Proposed changes

As discussed in here, we decided to introduce an off-chain method to detect malicious validators.

Types of changes

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• Bugfix
• KIP Proposal
• KIP Improvement

Checklist

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• Used the suggested template: https://github.com/kaiachain/KIPs/blob/main/kip-template.md
• I have read the CLA and signed by comment I have read the CLA Document and I hereby sign the CLA in first time contribution
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Related issues

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Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you proposed and what alternatives you have considered, etc.

[jiseongnoh]

Thank you for your outstanding contribution to Kaia!