feat(standalone): Create metrics module updating required metrics from HNS stats plugin

**Describe the solution you'd like**

This is part 2/2 of a POC on enabling retina to work outside of Kubernetes (ACI) and collect pod level information such as name and namespace by running it as a binary on the host Windows VM

This issue should encapsulate the following requirements:
* Create a new metrics module for standalone
* The metrics module should trigger each relevant metric to process the flows passed from the enricher
* The HNS plugin to send flows
* Return advanced metrics containing the enriched metadata from each flow

The following metrics are required:
* DNS
* Drop
* Forward
* HNS
* TCP connection
* TCP Flags

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.