Allow connecting to multiple streams

[adarsh112]

Currently spark structured streaming with kafka allows to connect to multiple kafka topics from the same spark context .
// Subscribe to multiple topics, specifying explicit Kafka offsets
val df = spark
.read
.format("kafka")
.option("kafka.bootstrap.servers", "host1:port1,host2:port2")
.option("subscribe", "topic1,topic2")
.option("startingOffsets", """{"topic1":{"0":23,"1":-2},"topic2":{"0":-2}}""")
.option("endingOffsets", """{"topic1":{"0":50,"1":-1},"topic2":{"0":-1}}""")
.load()

Looking for same feature in here as well.