Feat: apply config synthesizer.options in say task

[Catharsis68]

Feature Request

Use Case:

We want to apply advanced elevenlabs synthesizer options on a "global" level for a whole call via config verb.

Actual:
It is possible to apply the elevenlabs options via say task. synthesizer.options are being used when calling synthAudio
- with this approach, we'd need to define the options on every say task in our flow editor where we generate the say task payload

Goal:
We can send the same synthesizer.options at the beginning of a call via config task and if defined, they will be used for synthAudio. In the case the say task has it's own synthesizer.options, this should overwrite the "config" settings.

[xquanluu]

Hi @Catharsis68 I have tested this PR on jambonz.me,

Please help to test on your system please

[xquanluu]

I close this ticket as I remember @Catharsis68 already provided the PR for this