Integrate X-Ray into RECAP to detect bad redactions upon upload

[mlissner]

Once X-Ray has an API, we should do one of the following three things:

1. Add it as a feature to RECAP for uscourts.gov

2. Add it as a feature to RECAP, but only run it on uscourts.gov, with a extra permissions request to expand it to more domains (possibly via a setting).

3. Build a new extension that supports it.

Generally though, the idea is simple: When somebody uploads a document to a website, check if it has bad redactions. If so, alert them.

Right now, option 2 looks pretty great as a middle ground. We start helping filers that have RECAP installed without any additional privacy worries. Meanwhile if people want this turned on everywhere, they can do that.

[mlissner]

We'd need to be careful to do this as opt in, I suppose, since "sending all your docs to our API" is something people would not find amusing without consent.