Change mrcp_server to not store handler on registrar #26
Description
In the current code, when mrcp_server gets SESSION_CREATED, it instantiates a resource handler and stores it in the call in the registrar.
However, reading:
https://nact.io/en_uk/lesson/javascript/hierarchy
this is not necessary:
we just need to create the resource handler passing the uuid as its name and when an MRCP message with that uuid arrives we can check if there is a children using that name and if yes, relay the message to it.