Add Support of sending metrics to NewRelic Metrics Endpoint.

[maya-jha]

Feature Description

Add Support of sending metrics to NewRelic Metrics Endpoint. We want to use this package to send metrics to https://metric-api.newrelic.com/metric/v1. Add support of creating a NewRelics Metrics Client.

Describe Alternatives

Alternative is to duplicate the common code here to get it working for sending metrics.

Additional context

Add any other context here.