Provide CSV export

[atopal]

trafficstars

There should be a way to export the data to further analyze it outside of the dashboard. The export should be be initiated from the filtered list of features and should include:

• Feature Name
• Baseline status
• Percentage passing for each browser
• The date the feature became available (if applicable) for each browser
• Version number the feature became available in for each browser

[foolip]

The date the feature became available (if applicable) for each browser

This information isn't in web-features, but could be derived from web-features and BCD together. If the use cases for this information are strong, we could also consider putting it into web-features.

[atopal]

That would probably be required by caniuse.com, right?

Edit: Ah, we have version numbers which would have to be associated with release dates.

[foolip]

See also https://github.com/GoogleChrome/webstatus.dev/issues/280 about JSON. We probably only need one format, or at least 99% of the implementation should be the same regardless of format.

[dlaliberte]

Partially fixed by #427. Also see new subissues: #511 and #512