fix(material/slide-toggle): NVDA reading out clickable before label

[crisbeto]

Similar fix to #22446 for the slide toggle. Moves around the DOM in order to avoid the behavior where NVDA will read out "clickable" before the label, if the input parent has a click or mousedown listener. Includes the following changes:

1. Moving the input out of the ripple target for the current slide toggle. The input is invisible so it doesn't really matter where we put it.
2. Using the input as the ripple target in the MDC slide toggle. The input covers the entire container so the result is the same.

[mmalerba]

I'm seeing a screenshot in google that seems to show this broke strong focus indicators for the slide toggle

[crisbeto]

Pushed a fix for the strong focus indicators.

[crisbeto]

I can't reproduce the original issue here anymore. Closing.

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