✨ Optimize LexSlu #1282 and expand NLU data #1283 #1331

[rmtuckerphx]

Proposed Changes

This PR adds an optimization so that the NLU API won't be called is the ASR output was called. This same time and $$.
Issue #1282

Lex allows you to specify required slots and it will do the slot filling for you. The additional properties on NLU data needed for this are state, confirmationState and messages. Issue #1283

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

[jankoenig]

Thank you @rmtuckerphx, this looks great!

I just updated the docs a bit, mainly for clarity (e.g. adding links to other docs). Could you take another look if that works for you? Thanks

[rmtuckerphx]

Looks good @jankoenig
Thank you.

[aswetlow]

Thank you!