Feat: add ability to set custom render logic

[GoodBoyDigital]

A new RenderContainer class that lets you customise how its rendered.

// pass in a custom render function! easy peasy!
const container = new RenderContainer((renderer: Renderer) => {
        // clear the screen!
        renderer.clear({
            clearColor: 'green',
        });
});

[codesandbox-ci]

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