Support Non roll-up dataset

[sachinkbansal]

I should be able to run anomaly detection on metrics that are not additive.

Below are a few examples of aggregate functions in a dataset's SQL GROUP BY that can then be supported:
COUNT(DISTINCT)
MIN()
MAX()
AVG()
Custom Percentage calculations

Dataset SQL can have zero or 1+ dimensions. Since data cannot be rolled up, anomaly definition cannot define anomaly explosion. Instead, dataset SQL itself defines the extent of explosion.
e.g. Say a dataset has 2 dimensions and 1 metric - State, Brand, ConversionRate. This means anomaly objects must be created for each state+brand combination. We cannot have an anomaly definition for a single dimension or no dimension.

• impacts Anomaly Definition screen and logic
• impacts anomaly object creation process
• RCA must be disabled for such anomaly cards