API: getProcessedReport metadata API new parameter showRawMetrics to return all raw metrics #3585

Requested by Gregor as it's needed for advanced datavis such as: #1652

This would return new metrics such as: Goals metrics, bounce count, sum time spent on site.

Example returned dataset:

<reportData>
        <row>
            <label>France</label>
            <nb_uniq_visitors>1</nb_uniq_visitors>
            <nb_visits>1</nb_visits>
            <nb_actions>1</nb_actions>
            <max_actions>1</max_actions>
            <sum_visit_length>1086</sum_visit_length>
            <bounce_count>1</bounce_count>
            <goals>
                <row idgoal='3'>
                    <nb_conversions>1</nb_conversions>
                    <nb_visits_converted>1</nb_visits_converted>
                    <revenue>42.26</revenue>
                </row>
            </goals>
            <nb_conversions>1</nb_conversions>
            <revenue>$ 42.26</revenue>
            <nb_actions_per_visit>1</nb_actions_per_visit>
            <avg_time_on_site>00:18:06</avg_time_on_site>
            <bounce_rate>100%</bounce_rate>
        </row>
    </reportData>

(In [7558]) Fixes #3585 New parameter showRawMetrics and updated tests