AggregateSignatures takes in an input slice of bls.Signatures and aggregates them into a single bls.Signature.

VerifyAggregateSignatureMultiplePayloads takes in a slice of bls.PublicKeys, a bls.Signature, and a slice of payloads.

VerifyAggregateSignatureSinglePayload takes in a slice of bls.PublicKeys, a bls.Signature, and a single payload and returns true if every bls.PublicKey in the slice signed the payload.