CBG-3917: pass revNo from cbgt into feed event

[gregns1]

CBG-3917

• Passes rev no from cbgt into feed event
• No test, can't find a nice way to assert on this like Tor did in his PR on the dcp client given this is managed by cbgt. I ran import unit test and stuck break point on the feed event and visually verified that the revNo is populated.

Pre-review checklist

• Removed debug logging (fmt.Print, log.Print, ...)
• Logging sensitive data? Make sure it's tagged (e.g. base.UD(docID), base.MD(dbName))
• Updated relevant information in the API specifications (such as endpoint descriptions, schemas, ...) in docs/api

Integration Tests

• GSI=true,xattrs=true https://jenkins.sgwdev.com/job/SyncGateway-Integration/2660/

[torcolvin]

Can you run go.mod tidy?

I'd be OK upgrading cbgt on main too so these aren't out of sync, but I don't have a strong preference on that.