suggest adding a check for shouldPrepare() in RecordLayer when sending record data

[GSoJC234]

Hello,

I noticed that the Record class supports the shouldPrepare option; however,
the sendConfiguration and sendData methods in the RecordLayer class currently do not account for cases where shouldPrepare is set to false.

To enhance functionality, I suggest adding a check for shouldPrepare within both sendConfiguration and sendData methods before creating a RecordPreparator object.
Here's an example of how this could be implemented

In the sendConfiguration method

if (encryptor.getRecordCipher(writeEpoch).getState().getVersion().isDTLS() && record.getEpoch() == null) {
    record.setEpoch(writeEpoch);
}
if (record.getCleanProtocolMessageBytes() == null) {
    record.setCleanProtocolMessageBytes(new byte[0]);
}
// add checking shouldPrepare option
if (record.shouldPrepare()){
    RecordPreparator preparator = record.getRecordPreparator(context, encryptor, compressor, contentType);
    preparator.prepare();
    preparator.afterPrepare();
}

In the sendData method

for (Record record : records) {
    ProtocolMessageType contentType = record.getContentMessageType();
    if (contentType == null) {
        contentType = type;
    }
    if (encryptor.getRecordCipher(writeEpoch).getState().getVersion().isDTLS()) {
        record.setEpoch(writeEpoch);
    }
// add checking shouldPrepare option
    if (record.shouldPrepare()){
        RecordPreparator preparator =
                record.getRecordPreparator(context, encryptor, compressor, contentType);
        preparator.prepare();
        preparator.afterPrepare();
    }

Additionally, while the RecordLayer class extends ProtocolLayer class, which implements the prepareDataContainer method,
it currently supports only a default record preparator, which assigns null value to both the encryptor and decryptor fields.