Create GrowthAnalytics class.
Add submodule growthbeat-java.
Update GrowthAnalytics initialize method.
Create Event class.
Create Tag class.
Create Segment class.
Create Metric class.
Create ClientEvent class.
Create ClientTag class.
change response of delete API.
Add Event function .
Add Tag function.
Add Metric function.
Add ClientEvent function.
Add ClientTag function.