URI parse interprets `socketTimeoutMS` value as seconds (not ms)

MongoURI::connect parses the value of the argument, then passes it to ConnectionString::connect, which hands it off to DBClientConnection::setSoTimeout which takes seconds.

Since this is clearly too easy to get wrong, I think the fix should be to switch to using durations. for all of the above.

However the alternative is to divide by 1000 right after parsing because ConnectionString::connect is also called (correctly?) with a value in seconds.