Refactor AkkaBootstrap to handle multiple Callable types
return writeResponse results as it can holds Async informations
Refactor WisdomHandler to handle asynchronous content encoding

* add fromAsync parameter to write / finalizeWrite to know is their call is from an async result and need cleanup at the end
* Remove cleanup after AsyncResult handling as there could be an async content encoding running
* Extract content encoding from process result to handle it in writeResponse
* Add a proceedAsyncEncoding function to encode content InputStream asynchronously
* FinalizeWrite now check if the call is from an Async function and if keepAlive is not set, cleanup this handler