Introduces a complete query system for iterating over entities with
specific component combinations, including support for "with" and
"without" filters.
Also adds:
- `ISystem` and `ITickedSystem` interfaces for defining logic.
- `SystemGroup` for managing and running groups of systems.
- `QueryBuilder` for a fluent API to construct queries.
- `QueryExecutor` for high-performance iteration using ref parameters.
- `Tick` and `TickType` to support timed and logical updates.
