Data freshness metric

[vandanavk]

Is your feature request related to a problem? Please describe.
I did not find Data freshness metric in the list of Analyzers. We would need this to verify we have the latest data

Describe the solution you'd like
An analyzer in deequ and pydeequ that can check data for staleness by days, hours, minutes

Describe alternatives you've considered
Considered using Python code to determine freshness but its probably more optimized in deequ (Scala)