[ATO-2131] Instrument ActionExecutor._create_api_response

[Tawakalt]

Proposed changes:

• Fixes ATO-2131

Views from Jaegar UI

Status (please check what you already did):

• [x] made PR ready for code review
• [x] added some tests for the functionality
• [ ] updated the documentation in the rasaHQ/rasa
• [x] updated the changelog (please check changelog for instructions)
• [x] reformat files using black (please check Readme for instructions)

[Tawakalt]

Update at 005cfa0471baa0fba10ecc4ad80d3018cc9de214 Updated JaegarUI screenshots as well.