Add a card delegate

[AIIX]

Description

• This delegate provides a card background design.
• The card delegate supports setting a background image or background color via color overlay for the card item.
• The card delegate supports setting a custom card item radius, in case anyone wants to do square cards or full screen cards

Type of PR

If your PR fits more than one category, there is a high chance you should submit more than one PR. Please consider this carefully before opening the PR. Either delete those that do not apply, or add an x between the square brackets like so: - [x]

• [ ] Bugfix
• [x] Feature implementation
• [ ] Refactor of code (without functional changes)
• [ ] Documentation improvements
• [ ] Test improvements

Testing

Mycroft.CardDelegate {
    id: rexample
    cardBackgoundOverlayColor: Qt.rgba(0, 0, 0, 0.5)
    cardBackgroundImage: "someimage.png"

    Text {
        color: "white"
        text: "This Is Sample Content"
    }
}

Supported Properties

cardBackgoundOverlayColor: Qt.rgba(255, 255, 255, 0.5) (Default)
cardBackgroundImage: "" (Default: Empty)
cardRadius: 20 (Default As Per Figma)