SCRAM-SHA-512 support

From https://github.com/CallistoLabsNYC/samsa?tab=readme-ov-file#sasl-support > We include support for SASL using all typical mechanisms: PLAIN, SCRAM-SHA-256, SCRAM-SHA-512. This is represented as another type of BrokerConnection that our Consumers and Producers recieve as a generic parameter. All that is needed is to provide the credentials. I'm attempting to utilize `SCRAM-SHA-512`, but I noticed `SCRAM-SHA-256` is hardcoded here: https://github.com/CallistoLabsNYC/samsa/blob/main/src/network/sasl.rs#L71 Does this still need to be implemented?