wrapper for extension type: allow extension config from server.pp

[ikonia]

Summary

using the same merge pattern as server::roles to the role type, server::grants to the grant type this follows the same pattern creating the parameter extensions to access the extension type allowing extensions to be configured against database directly from server.pp

There is additional logic as there is a condition where you can define an extension against a database that has not yet been created (if the database has not been defined or server::database has not executed in this scenario there is logic to create the database first with the concept that there is no point trying to configure against an extension against a database you don't want to exist, so it is likely this database is either managed outside of the module, managed in the module but has not yet been properly configured (server::databases has not run) in which case the initial creation is done here and then the actual full database configuration will happen post the extension creation. This seems an acceptable way to handle this problem.

Additional Context

Add any additional context about the problem here.

• Root cause and the steps to reproduce. (If applicable)
• [ x] Thought process behind the implementation.

following a proven pattern with roles -> server::roles , grants -> server::grants (and other variations that are still pending merge)

Related Issues (if any)

Mention any related issues or pull requests.

Checklist

• [x ] 🟢 Spec tests.
• [x ] 🟢 Acceptance tests.
• [x ] Manually verified. (For example puppet apply)