`<Thumbnail>` component #1389

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Currently, the @remotion/player package has a <Player> component for playing a video on the web. A common task is to display a thumbnail of a video somewhere on the page, and to accomplish that, one could render a Player and disable all interactivity and freeze it.

I propose a new <Thumbnail> component that gets shipped in the Player package that only displays a still image. The implementation could be similar to the Player, but without controls. Also logic from the<Thumbnail> component from the preview could be used: https://github.com/remotion-dev/remotion/blob/b579cc25eea72d1123f7de6bd75bd2605b579bbc/packages/cli/src/editor/components/Thumbnail.tsx

Acceptance criteria

• Implement a new <Thumbnail> component that fits the description above and export it in the <Player> package
• Should have at least props for dimensions and style like for <Player>
• Write a documentation page describing all the props and an example snippet.