Use a single task to handle all input device listeners instead of one per instance

**Motivation:**
Currently, each input device (buttons, digital/analog inputs, etc.) spawns its own internal task to poll pin values. This is inefficient.
The goal is to consolidate this into a single shared task that monitors all relevant pins, leveraging attributes like _digital_reported_pins_ in `IoData`.

This would reduce task overhead and improve runtime performance, especially in configurations with many input devices.

**Notes:**
The implementation strategy is still open: this issue requires investigation to determine the best design.

**API Changes:**
None. This is an internal optimization with no external impact.