wazo-calld / wazo-call-logd: link a call to a CDR

As an application user
I want to save a link to the CDR when a call is ended
In order to find recordings of the call later

Technical proposition:

• DONE: The call events (including call hangup event) contains a conversation ID

• DONE: A conversation ID can be converted into a CDR ID

• TODO: Add a REST API to get a CDR (and recordings) from a conversation ID

• TODO: Add conversation ID in the CDR and recording events to be able to have a recording link

Acceptance criteria:

• Get the corresponding CDR from a conversation ID

• An event is sent when the CDR is created, containing the conversation ID

• An event is sent when a recording is created, containing the conversation ID