feat: add MutliCall

[codeislight1]

MutliCall allows aave v3 users to perform multiple calls to Pool functions in a single transaction, thus saving on base gas fees. So it would make it easier for users for example:

• supply -> borrow
• repay -> withdraw
• supply multiple assets
• withdraw multiple assets
• borrow multiple assets
• and much more...

let me know if there is anything that should be changed, I tried to write tests, but I stumbled upon
some errors while running tests on docker.

[height]

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[eboadom]

Nice contribution @codeislight1. One question, why did you decide to keep "low level" bytes as the input for the new function?
The approach provides generalization, but I'm wondering if it could create issues in the future if any function (deposit, borrow) would change signature

[codeislight1]

Nice contribution @codeislight1. One question, why did you decide to keep "low level" bytes as the input for the new function? The approach provides generalization, but I'm wondering if it could create issues in the future if any function (deposit, borrow) would change signature

Hi bandon, thank you for the review! for the low level call it's purely to efficiently acquire the function inputs directly from the calldata, without copying to memory. if the signature ever changes, it should just:

• pass 0x20*(argument index) as input to Calldata library function
• use the appropriate datatype getter

but that comes with the limitation of only passing up to 7 arguments, simple workaround is to pass the argument index to the Calldata library getter functions, multiply it by 0x20. thus compromising on 5 gas saving on MUL opcode.

the implementation is somewhat inspired by Universal Router Dispatcher by Uniswap:
https://github.com/Uniswap/universal-router/blob/main/contracts/base/Dispatcher.sol#L51

[codeislight1]

btw, for readability sake, i believe abi.decode would do the job, let me know if you d like to proceed with it as is, or decode it using abi.decode which is much cleaner

[codeislight1]

@eboadom any update 👀

[codeislight1]

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