[Implement] Create document preview component

[vsgoulart]

Epic https://github.com/camunda/product-hub/issues/2592, part of the Document handling https://github.com/camunda/product-hub/issues/2555
Design mocks: link

What should we do?

Following up on #1239 would like to also add the possibility to preview and download files in a form

• Create a new file preview component according to the mocks
  • This new component will have the following configurations on the properties panel: Label, Document reference and optionally configure the Endpoint
    • Label: a title shown on the top of the list documents
    • Document reference: the variable in the context which form-js will use to render the files
    • Endpoint: the key in the context which will have the endpoint URL which will be used to fetch each file. By default, it is set to the Camunda API endpoint.
  • Each file should be downloadable
  • PDFs and images should be previewable for any other format we will show the filename

Why should we do it?

So users can consume files uploaded in other forms or services

[volodymyr-melnykc]

Design for the document preview component in forms:

https://www.figma.com/design/J78Djf3PgCEAPxFD86floX/Form-Editor-Components?node-id=1078-729&t=sC5vhpadMvDHwpWT-1

[marcosgvieira]

@vsgoulart I believe this one is only missing documentation, correct?

[vsgoulart]

@marcosgvieira The PR is open: camunda/camunda-docs#4773