ICRC-2 & ICRC-3: Approve and Transfer From & Get Transactions #18
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This PR adds the ICRC-2 and ICRC-3 Standards for Approve and Transfer From methods (icrc2_approve, icrc2_transfer_from, icrc2_allowance) as specified in the DFINITY ICRC-2 Standard Methods and Get Transactions method (icrc3_get_transactions) as specified in DFINITY ICRC-3 Standard Methods. Methods from ICRC-1 are supported by reusing code from the ICRC-1 codebase, with icrc1_supported_standards modified to report in addition the ICRC-2 and ICRC-3 standards.
Actor tests for the new standard methods have also been created, covering ApproveError and TransferFromError cases, as well as the examples defined in the DFINITY ICRC-2 Standard Examples.