Generic JDBC support?

[znd4]

JDBC has a getMetadata method, which is probably how DataGrip supports custom drivers (like Cloudera's Apache Impala one)

Would you be open to including this if someone were to contribute it? The biggest open question in my mind is how driver distribution would work. (Leave it up to users, pull them from Java ecosystem CDN that I don't know about, or bundle it into the repo, perhaps with git-lfs 🤢)