[feat] Add `unit_to_scale` param for the activation function that only accept unitless input

Add `unit_to_scale` param for the activation function that only accept unitless input. Allow the Quantity and `unit_to_scale` as inputs for some activation function together.

Like below:
```python
import saiunit as u

x = 3 * u.mV
u.math.sigmoid(x)  #failed
u.math.sigmoid(x, unit_to_scale=u.mV)  #success
```