LU Merge functionality

[scheyal]

Proposal

We need to create a LU Merge functionality (maybe as part of LU Parser). LU Merge, at minimum shall merge LU "imported" content into target LU file under specified label.

The LU Merge functionality can serve several functions such as:

• Merge child LU's into parent for dispatching to skills. Consider adding a skill in Composer, retrieving the skill LU and merging it into parent dialog (be it Orchestrator or LUIS), merging is a required step towards that automation.
• Child dialogs (QnA, LUIS) can be merged for redirection from parent to child - possibly with the ability to hydrate the "sibling" as well. This could serve as a new method for cross-training.
• Create server side LU generation from field data - use app insights to generate LU from user responses, assisted by a moderator for machine teaching scenarios.