[Feature]: Implement ERC-7540 (Asynchronous Vault Operations)

[JMSBPP]

Summary

Implement LibERC7540 library and ERC7540Facet to support asynchronous deposit and redemption operations for vaults, extending ERC-4626 functionality.

Motivation / Context

Note: ERC-7540 is an extension of ERC-4626. This implementation should be completed after ERC-4626 is merged (see Issue #19 and PR #154).

Scope

• LibERC7540.sol: Library with internal functions for asynchronous vault operations (request queue management, status tracking, settlement logic)
• ERC7540Facet.sol: Facet implementing ERC-7540 standard interface
• Diamond storage pattern following Compose conventions
• Custom errors following ERC-6093 standard

References

• ERC-7540 Standard
• ERC-4626 Standard
• Issue #19 - ERC-4626 Implementation

[akronim26]

Could I take this up?

[JMSBPP]

Hey @mudgen @maxnorm. I've been following ERC-2535 and came up with this proposal. Would appreciate your insight. ERC-165 is merged and ERC-4626 is in code review, so this seems like a good follow-up. See the EIP graph and community discussion.

@akronim26 we can align on shipping this if it looks good. Looking forward!

[maxnorm]

Hi @JMSBPP! Thanks to the suggestion.

I'll be reviewing the ERC4626 tomorrow. I will take a look into ERC7540 and check with @mudgen

the mentality is to support as much as possible, so our users doesn't need to create the implementation.

We will mostly go foward, but i'll keep you both updated. @JMSBPP & @akronim26

[maxnorm]

Hi y'all, I reviewed the PR for ERC4626 and there still work to do before merging it.

I'll like to add this async vault but I think the best for now is to wait for the basic foundation of ERC4626 before building extension on top.

We will definitely go foward but I need to put a hold for now.

In the meantime, I suggest to go review the PR and maybe collab to make ERC4626 ready.