feat/Influx sink - support multiple retention policies

[rajuGT]

Context:
Some of the measurements/series you're interested in live data, old
data is not so useful/interesting
OR
Say you've high frequency influx points and you've summarry/aggregated
points. You would like to keep summary points for over weeks/months
whereas granular/high frequency data can't be kept for that duration

For the above mentioned cases - one can utilize the retention policies
where; same db, same measurement, but different retention policy.

Details:
Add a new configuration SINK_INFLUX_RETENTION_POLICY_LIST_KEY which is similar to SINK_INFLUX_MEASUREMENTS_LIST_KEY and the usage similar how we used multiple measurements.
In custom jobs we would like to configure the sink like

measurements = String.split(configuration.getString(SINK_INFLUX_MEASUREMENTS_LIST_KEY), ',')
measurementName = measurements[0]

retention_policies = String.split(configuration.getString(SINK_INFLUX_RETENTION_POLICY_LIST_KEY), ',')
retentionPolicy = retention_policies[1]

getSink(measurement_name, retentionPolicy, .....and other args)

and refactor - overrides are packaged in an object instead of increasing parameters of the methods