This allows the following arguments to be passed to `device.connect()`:

* scan_duration_ms
* min_conn_interval_us
* max_conn_interval_us

These are passed as-is to `gap_connect()`.  The default value for all of
these is `None`, which causes gap_connect to use its own defaults.

Signed-off-by: Joris van der Wel <joris@jorisvanderwel.com>