Clarify usage of coordinator by analysis_callgraph

* Comment in dialyzer_analysis_callgraph what the call to
  dialyzer_coordinator does;

* Delegate activation request to each dialyzer_worker;

  * There is no reason for the dialyzer_coordinator to request
    activation on behalf of the workers: let each worker request its
    own activation as it leads to more consistent dialyzer_worker
    module (activation is request as soon as status running is hit -
    reguardless of mode) and it reduces lines of code.

* Clarify types in coordinator and worker e.g. make opaque and make
  type more strict.

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