Kafka ignores user configuration on FETCH_OFFSET_NUM_RETRY and FETCH_OFFSET_RETRY_INTERVAL_MS

There are "unsafe" conversions in the Kafka connector.
CaseInsensitiveStringMap comes in which is then converted the following way:

...
options.asScala.toMap
...

The main problem with this is that such case it looses its case insensitive nature
(case insensitive map is converting the key to lower case when get/contains called).