Support sqlite:// URI scheme

[clue]

• https://www.sqlite.org/uri.html
• https://docs.sqlalchemy.org/en/14/core/engines.html#sqlite
• https://en.wikipedia.org/wiki/File_URI_scheme#How_many_slashes?

Refs #47