Adding ActivationQueryBase into the scope template to respond to button clicks

Currently, in our scope template, there is no code touching the ActivationQueryBase, which is needed for responding the button/actions clicks. It is needed in the rating-input PreviewWidget as well.

I would commend adding it into the template to make it more complete though some of the scopes may not need them. A reference design is like:

action.h

#ifndef SCOPE_ACTION_H_
#define SCOPE_ACTION_H_

#include <unity/scopes/ActionMetadata.h>
#include <unity/scopes/ActivationQueryBase.h>
#include <unity/scopes/ActivationResponse.h>
#include <unity/scopes/Result.h>

class Action : public unity::scopes::ActivationQueryBase
{
public:
    Action(unity::scopes::Result const& result,
           unity::scopes::ActionMetadata const& metadata,
           std::string const& action_id);
    ~Action() = default;

     virtual unity::scopes::ActivationResponse activate() override;

private:
    std::string const action_id_;
};

#endif // SCOPE_ACTION_H_

action.cpp

`#include <scope/action.h>
#include <unity/scopes/ActivationResponse.h>
#include <unity/UnityExceptions.h>

#include <QString>
#include <QDebug>

#include <iostream>

namespace sc = unity::scopes;
using namespace std;

QString qstr_(std::string str)
{
    return QString::fromStdString(str);
}

Action::Action(const unity::scopes::Result &result,
               const unity::scopes::ActionMetadata &metadata,
               std::string const& action_id)
    : sc::ActivationQueryBase(result, metadata),
      action_id_(action_id)
{
    qDebug() << "action id: " << qstr_(action_id_);
}

sc::ActivationResponse Action::activate()
{
    qDebug() << "action id in activate: " << qstr_(action_id());

    QString review = QString("%1").arg(qstr_(action_metadata().scope_data().
                                              get_dict()["review"].get_string()));

    double rating = action_metadata().scope_data().
                          get_dict()["rating"].get_double();

    qDebug() << "review: " << review;
    qDebug() << "rating: " << rating;

    sc::ActivationResponse done(sc::ActivationResponse::ShowDash);
    cerr << "activate called" << endl;
    return done;
}