Environment support is missing from ApigeeX APi product #358

Description

https://github.com/apigee/apigee-client-php/blob/3.0.5/src/Api/ApigeeX/Entity/ApiProductInterface.php should also extend \Apigee\Edge\Entity\Property\EnvironmentsPropertyInterface and information should be added by the related controller.

https://cloud.google.com/apigee/docs/reference/apis/apigee/rest/v1/organizations.apiproducts#ApiProduct

Steps to Reproduce

Actual Behavior

Expected Behavior

Screenshots

Notes

Version Info

3.0.4