[Twillio] Create the injector for pre-recorded phone calls

[SamuelHassine]

Problem to Solve

Integration phone calls platforms

Current Workaround

{ Please describe how you currently solve or work around this problem, given OpenEx's limitation. }

Proposed Solution

{ Please describe the solution you would like OpenEx to provide, to solve the problem above. }

Additional Information

{ Any additional information, including logs or screenshots if you have any. }