Disable p2p block sync

[canonbrother]

What would you like to be added:

To disable p2p block sync.
Note: do not sync whatever announced block

Why is this needed:

By design, safety wise, we don't allow p2p call in between substrate node. The block generation will be all controlled by DNC. For more details ---> https://metachain.netlify.app/meta-chain-protocol/consensus#block-connecting

[defichain-bot]

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Details

I am a bot created to help the DeFiCh developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[fuxingloh]

/area meta

I want to add that p2p block syncing should be disabled but p2p transaction broadcasting should be enabled.