Add Composer Support via PIE

[onairmarc]

Summary

PIE is a CLI tool powered by Composer and Packagist. It allows PHP applications and packages to define their dependencies.

Desired Behavior

The New Relic PHP Agent should be installable as a dependency for any PHP application or package. Allowing the extension to be installed via PIE will make deployments much easier on hosts that don't automatically offer the agent.

Possible Solution

Follow the instructions detailed in the PIE documentation to add the New Relic PHP Agent to the Packagist registry. It appears all that is needed is the creation of a composer.json file.

Additional context

We are exploring alternative deployment strategies for our Laravel application. Our current solution offers the New Relic PHP Agent automatically. But this is not the case for the alternate solutions we are exploring. Adding PIE/Composer support would make this much easier for many developers