fix up pulsar-flink and flink-consumer-source (#3212)

### Motivation

fix up flink-consumer-source example run error

### Modifications

modify pom.xml, sl4j and log4j2

### Result

1. log conflict, sl4j and log4j2
2. flink-consumer-source example use pulsar-flink model class and api, cann't execution
3. pulsar-flink not use jar but flink-consumer-source use, like flink-scala
1 file changed