Switch onchange errors

[MrVauxs]

Current Behavior

Documentation states that Switch can be used with onchange property. However, currently there are two issues regarding it:

1. The property does not exist in the elements types.
2. Adding the property causes a slew of the following warnings:
   

The function instead of running returns the same warning whenever the switch state changes. on:change does not throw a type error, but does not do anything, not even the aforementioned warning

Expected Behavior

onchange working.

Steps To Reproduce

Copy paste what the documentation says in the Lightswitch example.

Link to Reproduction / Stackblitz

https://github.com/MrVauxs/skeletonrepro

More Information

[endigo9740]

See also: #2851

[phamduylong]

I'll investigate this issue.