Feat: Gathering all configs to one place

[logicalangel]

We should free all codes from getting and checking configs. all these configs should go in one place.

So we should:

• Use a library to get configs from envs and yaml files, which I recommend:
  "github.com/ilyakaznacheev/cleanenv"

• Use go validator to check the correctness of configs, using annotations.

• Provide them using a singleton or a public struct value

• Refactor current codes to use this solution.