feat: add thumbnail sidebar

[optimalcharb]

Refer to the docs: https://www.embedpdf.com/docs/react/plugins/plugin-thumbnail
And outdated example: https://github.com/embedpdf/embed-pdf-viewer/blob/feature/multi-view/website/src/content/docs/react/code-examples/thumbnail-example.tsx

[optimalcharb]

Mostly completed by using scrollCapability in the store. Also need to add scrollState to the store and use that.