Change props.spec to props.options

[pearmini]

Refactor props

• Remove props.spec
• Add props.options

Example

// Before
export function Demo() {
  return (
    <Chart
      spec={{
        type: "interval",
        data: [
          { genre: "Sports", sold: 275 },
          { genre: "Strategy", sold: 115 },
          { genre: "Action", sold: 120 },
          { genre: "Shooter", sold: 350 },
          { genre: "Other", sold: 150 },
        ],
        encode: { x: "genre", y: "sold" },
      }}
      options={{
        renderer: new Renderer(),
        autoFit: true,
      }}
    />
  );
}

// After
export function Demo() {
  return (
    <Chart
     options={{
        type: "interval",
        autoFit: true,
        data: [
          { genre: "Sports", sold: 275 },
          { genre: "Strategy", sold: 115 },
          { genre: "Action", sold: 120 },
          { genre: "Shooter", sold: 350 },
          { genre: "Other", sold: 150 },
        ],
        encode: { x: "genre", y: "sold" },
      }}
      renderer={new Renderer()}
    />
  );
}