Ruff configuration

Previously we were using only a few of Ruff's rules. Now we use stricter checking. Check here for all rule codes.

Main changes:

• removed isort dependency since imports sorting is now handled by ruff (faster and also allows for including __from__ future import annotations in every file so future upgrade to newer version of Python will be easier)
• now there is a check for if TYPE_CHECKING imports, so it is required to place them in this section (its an huge advantage since it resolves an issue with circular imports)