[Feature Request]: Support Custom Events for CellEventCoordinator

### Guidelines

- [x] I agree to follow this project's Contributing Guidelines.

### Description

Currently, `CellEventCoordinator` only supports a predefined set of cell events (`didSelectCell`,`didDeselectCell`).
In many real-world scenarios, developers need to react to additional, domain-specific interactions that don’t fit into the existing event types. It would be very helpful if `ReactiveCollectionsKit` allowed users to define and emit custom events within `CellEventCoordinator`.

Example Use Case:

In many apps, analytics and event tracking are handled centrally at the ViewController level. For example, when a cell triggers a specific business interaction (e.g., "Add to Favorites", "Open Detail with Special Mode", or "Trigger custom SDK event"), we want to forward this as a typed event through the same coordinator pipeline rather than creating parallel event systems. Custom events would make it possible to standardize these flows while still leveraging the existing reactive structure.

### Problem

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### Proposed Solution

N/A

### Alternatives Considered

N/A