Feature Request: Netchecks API

Add an API to list/create/delete network assertions and their related policy reports.

An API running in a container that allows users to administrate NetworkAssertions, ideally to debug/run test assertions, see their results, and perhaps eventually configure the actions to take on failure (alerts). Should be optionally deployed with the operator.

POC: a thin wrapper around the k8s api for NetworkAssertions and PolicyReports.

## Why? Why Not

Mostly to be the backend for a possible UI for Netchecks. Alternative is to directly use the k8s api which is fantastic for developers but not so good for everyone.

## Requirements

* Connect to local K8s cluster to manage namespaced network assertions and expose results.

## Out of scope

* Auth - Supporting Users, Groups, Orgs.
* Ability to configure alerts (slack + sending emails)
* Web UI for managing assertions, alerts, users, org settings etc.

## Design

Dockerized application exposing a simple REST API. This application will directly talk to the K8s api, and likely runs inside the cluster too. Ideally avoid duplicating the k8s data (networkassertions, policyreports etc).