feat: ERC-4626 extension

[Ifechukwudaniel]

Resolves #356

PR Checklist

• Tests
• Documentation
• Changelog

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[Ifechukwudaniel]

I just stared this

[0xNeshi]

I'll convert this to a draft, so that the team does not invest time reviewing a WIP

[Ifechukwudaniel]

@0xNeshi
The Solidity implementation uses safe transfer

SafeERC20.safeTransferFrom(_asset, caller, address(this), assets);

In the Solidity implementation, SafeERC20 is a utility library. However, in the Stylus implementation, SafeTransfer is a contract. What do you think

[0xNeshi]

@0xNeshi The Solidity implementation uses safe transfer

SafeERC20.safeTransferFrom(_asset, caller, address(this), assets);

In the Solidity implementation, SafeERC20 is a utility library. However, in the Stylus implementation, SafeTransfer is a contract. What do you think

See how VestingWallet handles this

[qalisander]

Great job guys!
Left a few comments

[0xNeshi]

I made decimal_offset part of state, so as to enable devs to override the value. This is similar to how we simulated Solidity's override functionality in Erc721Metadata::_base_uri by adding this state field, which is not part of Solidity version's storage.

Aside from enabling devs to override the decimals offset value, I was able to add additional test cases verifying what happens if this value overflows.

[bidzyyys]

LGTM! 🚀