feature request: `:containsData()` selector

[beer-psi]

From Jsoup:

:containsData(data)
elements that contains the specified data. The contents of script and style elements, and comment nodes (etc) are considered data nodes, not text nodes. The search is case insensitive. The data may appear in the found element, or any of its descendants.

[scinfu]

Hi,
yes, I'm working to port this feature