fix: invalid bignumber value - eth_estimateUserOperationGas

[saqlain1020]

Description

• Added validations for CG, VG, PVG, paymasterAndData, maxFeePerGas & maxPriorityFeePerGas using class-validators.
• Resolves [ERROR] Invalid Bignumber value - eth_estimateUserOperationGas #167

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
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• Refactoring (no functional changes, no api changes)
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Further comments (optional)

This update will throw Invalid json error, when not supplied with correct params in userop while estimating gas.
Before this change bundler was returning Bignumber undefined error when CG, VG , PVG etc was not supplied with the userOp, which made it harder to debug.

[0xSulpiride]

Thanks for reporting the issue! We should keep these fields optional as per the EIP. I investigated the issue and fixed it in this PR - #170

@saqlain1020

[saqlain1020]

@0xSulpiride Understood 👍