feat(kinesis): Updates KinesisStreamRecordSender.java (#3610)

Makes KinesisStreamRecordSender public in order to allow for greater customization when initializing AmazonKinesisClient and KinesisRecorder.

Co-authored-by: Michael Law <[email protected]>

aws-android-sdk-kinesis/src/main/java/com/amazonaws/mobileconnectors/kinesis/kinesisrecorder/KinesisStreamRecordSender.java

@@ -33,7 +33,7 @@
 /**
  * A implementation of {@link RecordSender} for Amazon Kinesis.
  */
-class KinesisStreamRecordSender implements RecordSender {
+public class KinesisStreamRecordSender implements RecordSender {
 
     private final AmazonKinesis client;
     private final String userAgent;