Port DAVE to Chromium extension

Same as #7552 (closed), but for Chromium :)

Some interestig specs are in the FF blueprint: https://tails.boum.org/blueprint/download_extension/

Related issues

Related to #7552 (closed)
Related to #12581 (closed)
Related to #12582 (closed)
Related to #12328 (closed)

Original created by @BitingBird on 8531 (Redmine)

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