feat: report checksummer userop.sender & markup on gas price

[0xSulpiride]

Description

• p2p: report checksummed userop.sender #111
• add markup on the gas price reported by eth_estimateUserOp

Types of changes

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• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation Update
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
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