endpoint statistics added as getrequest according to Discord, swagger…

[Jari1980]

… documentation added

Description

Get request for endpoint statistics with Swagger documentation.
Returning result from:
SELECT
AVG(home_team_score) AS avg_home_score,
AVG(away_team_score) AS avg_away_score,

MIN(home_team_score) AS min_home_score,
MAX(home_team_score) AS max_home_score,

MIN(away_team_score) AS min_away_score,
MAX(away_team_score) AS max_away_score

FROM matches;
as wanted in Discord.

Related Issue

Team statistics

Checklist

Add x inside [ ] to check if applicable, else leave unchecked:

Required

• Code runs locally

Optional

• Tests added or updated
• Configurations added or updated
• Documentation updated