[Wyscout V3] Extract team formation and player position changes out of raw event metadata

[DriesDeprest]

Formation changes with player position information are stored in Wyscout V3 event metadata.

"formations": {
        "3159": {
            "1H": {
                "0": {
                    "3-4-2-1": {
                        "id": 2589485,
                        "scheme": "3-4-2-1",
                        "matchPeriod": "1H",
                        "startSec": 0,
                        "endSec": 3987,
                        "players": [
                            {
                                "209117": {
                                    "playerId": 209117,
                                    "position": "rcmf"
                                }
                            },...

It would be good to use this as an input to build formation change events. The formation events can be extracted similarly as how we extract substitution events out of the "substitutions" information in the Wyscout V3 event metadata as done in: #368. This will also then help us to have more accurate players' positions in the meta data of the event dataset.