new api plugin to list operations per plugin type

[trel]

To automate the documentation of all dynamic PEPs, a list of operations, per plugin type, should be generated and sent to stdout as JSON.

• walk API table
• load all resources
• get array of operations
• dump microservice table
• dump all plugins
  • network
  • auth
  • database
  • resource
  • api
  • microservice
  • rule engine (needs introspection operation (list_rules) )
    • not unique-ified
    • boxed by language / instance