Resolve "Dashboard api calls"

Closes #110 (closed)

server/app/apis/statistics.py

-import app.core.http_codes as codes
-import app.database.controller as dbc
-from app.apis import check_jwt, item_response, list_response
-from app.core.dto import UserDTO
-from app.core.parsers import user_parser, user_search_parser
-from app.database.models import City, Competition, User
-from flask import request
-from flask_jwt_extended import get_jwt_identity, jwt_required
-from flask_restx import Namespace, Resource
-
-api = Namespace("statistics")
-
-
-@api.route("/")
-class Statistics(Resource):
-    @check_jwt(editor=True)
-    def get(self):
-        user_count = User.query.count()
-        competition_count = Competition.query.count()
-        region_count = City.query.count()
-        return {"users": user_count, "competitions": competition_count, "regions": region_count}, codes.OK