feat: add style prop support to element for passing styles as an object

[tuncayyildirtanuk]

Description

This PR introduces support for the style prop in the Element component, allowing styles to be passed as an object. This enhances flexibility by enabling dynamic style updates based on component state or props.

Changes Introduced
• Added the style prop to to support object-based styling.
• Updated the Box component example to demonstrate passing styles dynamically using elementStyle.

Code Example:

const Box = Blits.Component('Box', {
  components: {},
  template: `
    <Element
      w="150"
      h="150"
      color="#eeaabb"
      :scale="$focused ? 1.3 : 1"
      color="{top: 'red', right:'white', left: 'black', bottom: 'blue'}"
      style="$elementStyle"
    >
      <Text content="$item.title" :textStyle="{fontSize: 20, textColor: 0xffffff}" />
    </Element>`,
  props: ['index', 'item', 'focused'],
  state() {
    return {
      elementStyle: { a: 1, b: 2, c: 3, width: 120 }
    };
  },
});