Improve SQLite experience

[zaleslaw]

          Also i had to google some extra to find how do i read SQLite file. Like, it's a file, right? We have Connection, DbConnectionConfig or URL, so there's no direct option to open it. You need to know this syntax "sqlite://path/to/file.db". I don't use JDBC often, so i don't remember it :( I suggest to either put it here, or invent some API to easily open sqlite files. For example, a factory function `DbConnectionConfig.Sqlite(file)`

Originally posted by @koperagen in https://github.com/Kotlin/dataframe/pull/857#discussion_r1761142198