Add control over OpenType Features for QtQuick.Text

Qt6, starting with 6.6, supports font features in qtquick text:
https://doc.qt.io/qt-6/qml-qtquick-text.html#font.features-prop

Different fonts might have different features available, it's possible to get list of supported features for any available font via QFont:
https://doc.qt.io/qt-6/qfont.html#featureTags

For more info, there is a list of registered feature tags by MS and their description:
https://learn.microsoft.com/en-us/typography/opentype/spec/featurelist

Figma also supports it:
https://www.figma.com/plugin-docs/api/properties/TextNode-opentypefeatures/
So I expect feature requests and reports about visual discrepancies