[Statistics/Overall Season/API] Integrate Calculation of Key Metrics to the Leaderboards

[Trim0500]

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Feature Request

• At the time of creating this issue, there now exists a leaderboard view on OpenTracks to log and compare a user's stats with others based on total vertical, distance and ski days. However, the data used is completely fabricated as there is no implementation for the aggregation of these specific metrics to be able to compare.

Proposed Solution

• Integrate the service functions of aggregating all-time stats into the leaderboard for total vert, distance crossed and ski days entered.

Completeness Requirements

• The metrics for total vertical, distance crossed and ski days are used to display these metrics per user

Additional context

[Picard4]

We intend to replace the test data with real data (provided by Group 13) through the completion of Issue #67.

[Trim0500]

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• Some stats that a leaderboard would compare against is outlined in Leaderboard Ranking Based on Different Stats #79. Of interest in this issue would be Distance & Highest/Lowest Elevation

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