Allow getting the style for a element with css attributes.

[j-mendez]

I think adding the ability to get the style for an element with the correlation of the css would be impactful.

Currently working on this in another project kayle with the help of victor-tree. I think if the logic is done right it could move to a feature.

This would improve the ability to do certain logic during the select process ex: style.height = 0 continue to the next node etc.

[j-mendez]

Tagging for visibility @adamreichold @cfvescovo.

[cfvescovo]

Sorry, I totally forgot about this. If you have any suggestions or even some code ready to merge, feel free to open a PR. I will look into this ASAP

[cfvescovo]

P.S. A11yWatch rocks! Great project