feat(output-migration): enhancements

[eneajaho]

• [x] remove Output and EventEmitter from imports if not used anymore
• [x] append output/outputFromObservable to existing import from angular/core
• [x] replace private with protected for outputs to not break existing private scope usages
• [x] migrate the following case correctly

  
  @Output() someOutput: EventEmitter<DataInterface> = new EventEmitter();

// currently someOutput = output();

// should be someOutput = output();

Closes https://github.com/nartc/ngxtension-platform/issues/312

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[eneajaho]

In the end of the migration add a link to a discussion inside GitHub so devs can tell us if everything went great, or what can be improved or if there is any bug.