Upgrade pulsar client to 3.0.0 (#167)

* Upgrade pulsar client to 3.0.0

Author: aymkhalil

backfill-cli/gradle.properties

@@ -1,4 +1,2 @@
 artifact=backfill-cli
 mainClassName=com.datastax.oss.cdc.backfill.BackfillCLI
-
-pulsarVersion=2.11.0

gradle.properties

@@ -15,7 +15,7 @@ cassandra4Version=4.0.4
 dse4Version=6.8.23
 
 pulsarGroup=org.apache.pulsar
-pulsarVersion=2.10.3
+pulsarVersion=3.0.0
 # Used when running tests locally, CI will override those values
 testPulsarImage=datastax/lunastreaming
 testPulsarImageTag=2.10_3.4