driver: support _time_format DSN query param

Dan Petersonrequested to merge
danp128/sqlite:time-format into master

Building on the _pragma query param support added in 508747c9, support a new _time_format query param.

If _time_format is set to "sqlite", written times use the time package format "2006-01-02 15:04:05.999999999-07:00". This is the format mattn/go-sqlite3 uses and is format 4 at https://sqlite.org/lang_datefunc.html#time_values.

By default, times are formatted with time.Time.String. This maintains compatibility with existing users of the driver.

Fixes #47 (closed)

Edited by Dan Peterson

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