feat: add interval refresh on the sks people counter

[thesun901]

lastest_sks_user_data_repo.dart: add interval refresh sks_user_data.dart: refactor model attributes to match API responses

[mikolaj-jalocha]

@tomasz-trela if u have enought time, pls perform a review and ping me when done, I will check it out as well ;)

[tomasz-trela]

@mikolaj-jalocha