Add generic Attestation discount validator #36
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stevieraykatz
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Adds a discount validator for the attestations issued by the Coinbase Verification system: https://github.com/coinbase/verifications/tree/main
Two validation steps are completed per call:
claimeris fetched from the Coinbase attestation indexer and then validated agains EAS.validationDatais unpacked and signature validation is performed against the encoded signature to ensure that the Coinbase sybil resistance service has signed off on this discount.