Speech service add support for conversational speech reco for plugins

[sdetweil]

Description

some plugins need to ask the users questions, and speech reco is already working.. add easy apis they can use

Fixes Related issues

Checklist

• [X] I have read and understand the CONTRIBUTIONS.md file
• [X] I have searched for and linked related issues
• [X] I have added config.schema.json file if config option are required.
• [X] I am NOT targeting master branch