Add total hit count to GoogleAnalyticsStats

[robertvazan]

Currently the GoogleAnalyticsStats exposes separate counters for different hit types, but the most useful total hit counter is missing. Please add it.

While we are at this, consider using micrometer instead of creating your own metrics implementation.

[brsanthu]

Added getTotalHits stat. Not sure if integrating with micrometer would be a value add considering that it brings additional dependency.