Apache Pinot

please read this for more detailed  configs: <https://zookeeper.apache.org/doc/r3.4.3/zookeeperAdmin.html#sc_advancedConfiguration>

In the pinot k8s chart for 0.3.0 there doesn't seem to be any defaults for that. We have a
```ZK_PURGE_INTERVAL```
env set to "1", that's about it

Will do this and update, does it make sense to create a pr for the k8s values for zookeeper?

we can add purge interval and purge snapshots

Looks like it's as simple as setting `
```ZOO_AUTOPURGE_PURGEINTERVAL```
and