Package sqlitedsn builds SQLite connection strings carrying the defaults
Authula relies on, so that every SQLite connection - application or test -
behaves the same way.
Build turns a SQLite target - a file path, ":memory:", or an existing "file:"
URI with or without query parameters - into a DSN with Authula's defaults
applied. Parameters already present in the target are left untouched, so a
caller can always override a default.