Be able to configure the voip solution in Element

### Your use case

#### What would you like to do?
We would like to be able to build element-android client without the voip feature and its related dependences (webrtc, jitsi...)
A best solution would be to be able to custom the voip solution. The requested configuration would not be only with/withoutVoip, but a way to provide a module to handle the voip feature in the application

#### Why would you like to do it?
Ease customisation of Element

#### How would you like to achieve it?
- add a flavorDimension `voip` and define 2 flavors `withvoip` and `withoutvoip`
or
- extract the voip service in a module in order to be able to disable the service or customise the voip call handling in the application. For example this module may allow a fork of element-android to manage the voip calls outside the application

We would prefer the second option

### Have you considered any alternatives?

_No response_

### Additional context

_No response_