Configures various build related steps including code coverage and scan

* Enable build scan, coverage
* Enable cache and scala format check
* Configure scala format and format all files
* Add badge

Have a single Akka http based server running to host endpoints for 

1. `/metrics` - Prometheus
2. `/ping` - Health check -  If the stream reading from Kafka fails then this health check would start failing.

Also add a basic test infrastructure for HTTP related code paths

Capture more metrics and add more tags to monitor cold starts etc

Switch to Prometheus Java Client and make Kamon integration optional and configurable. This allows to publish metric to Prometheus by default and still provide a way to publish to any other Kamon support system via config

Extract a trait to define metric names which can be adapted per metric system conventions

Enable use of Kamon API to track common metrics which are not specific to any action. As such metrics would be bounded its safe to use Kamon Prometheus Exporter to manage them.

This ensures that such metrics can be tracked via one implementation and only action specific metrics would be tracked via 2 implementations

* Count successful invocations too
* Initialize status metrics

* Add default Grafana dashboard

* Add reference to Grafana Labs

* Change namespace and action variable names to camelCase

* Add singlestats for total, success, error and cold activations

* Additional metadata required by Grafana Labs

* Update dashboard UI

* Demo landing page image

* Temporary image path

* Change path to point to master branch image location

* Add reference on how to first configure ow docker-compose

* Add documentation on where the docker image can be found on docker hub

* State the name of the image too for easy docker pull

* Update Grafana dashboard to include only active labels
* Refresh interval should be: `On dashboard load`

* Add kind and memory labels to activations_total metric

* Format code as `scalafmt` instructed

* Format code as `testScalafmt` instructed

* Add kind and metric tags to KamonRecorder

…ortion (apache#29)

* Update dashboard to allow stack selection
* Add decimals to the existing gouges

* Add dashboard for global metrics
* Add tags and show list of dashboards
* Update to v6 to use from and to variables in table link

* Start Kamon reporters at startup
* Record rate of event processed
* Record global status metrics
* Add a global cold start counter
* Record other times

* Add initiator namespace tag for all metrics

* Use duration type for time related fields
* Assert that recording are using double precision

* Rename metrics
* Add hook to process metric events
* Add support for capturing the limit metrics

Update Dockerfile to extend the scala image
Add the :common:scala project dependency