A BLS signature aggregation combines a series of signatures into a single signature.
The test data is declared in a data.yaml file:
input: List[BLS Signature] -- list of input BLS signatures
output: BLS Signature -- expected output, single BLS signatureBLS Signature here is encoded as a string: hexadecimal encoding of 96 bytes (192 nibbles), prefixed with 0x.
The aggregate_sigs handler should aggregate the signatures in the input, and the result should match the expected output.