Android: Apply slider padding from css

[BlackJohnny]

Summary:

This PR applies the padding information from the CSS style associated to the Slider component.

This can be useful when you need to add some overlay on the slider.

NOTE: I did not add the support for IOS. Maybe someone could help with this.

Test Plan:

<Slider
    ...
    style={{paddingLeft: 10, paddingRight: 10}}
    />

or

<Slider
    ...
    style={{padding: 10}}
    />

[BlackJohnny]

Boss, will you merge, reject or request to update this feature? :)

[wojteg1337]

Since its java only, we will wait for iOS impl

[HITESH122]

Please fix for ios also

[BartoszKlonowski]

@BlackJohnny & @wojteg1337 I believe that this could solve the #258, how do you think?

[brycnguyen]

Any news on this?

[tastafur]

It would be nice if we could fix the padding issue #258