public static GraphQLScalarType bigIntScalar() {
    return GraphQLScalarType.newScalar()
        .name("BigInt")
        .description("A BigInt (UInt256) scalar")
        .coercing(BIG_INT_COERCING)
        .build();
  }
Creates a new GraphQLScalarType object for a BigInt.

<p>The object is configured with a specific Coercing implementation that defines how the BigInt
type is serialized, deserialized and validated.

@return a GraphQLScalarType object for a BigInt.
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/graphql/internal/Scalars.java