📋 [PUML TASK] - Update PUML Plugin to Use New API

[lizzcondrey]

Parent Feature

#761

Task Description

As an AaC Developer, I want to update the gen-puml plugin to use the new API, so that I provide an updated version of the capability. 

Acceptance Criteria

• Utilize the gen-plugin command from AaC to create all boilerplate plugin files.
• gen-puml init is updated to use the new API.
• gen-puml implementation is updated to use the new API. 
• gen-puml unit tests are updated to use the new API. 

Unresolved questions

No response