ERC-7540 API

ERC-7540 asynchronous tokenised vault support.

ERC-7540 extends ERC-4626 with asynchronous deposit and redemption flows, enabling vaults that require processing time for deposits and withdrawals.

eth_defi.erc_7540.vault	Protocol-neutral ERC-7540 asynchronous vault support.
eth_defi.erc_7540.deposit_redeem	Protocol-neutral ERC-7540 deposit and redemption flows.