docs: add new plugin for verifying contracts on evm chains and xlayer…

[fwx5618177]

This PR simply adds a new plugin named @okxweb3/hardhat-explorer-verify which is used to verify smart contracts deployed on EVM chains including XLayer of OKX.

It can be found on this: https://github.com/okx/hardhat-explorer-verify.
It's npm repo: https://www.npmjs.com/package/@okxweb3/hardhat-explorer-verify

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Latest commit: c158fe3

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 14, 2024 0:32am