feat (simple_dual_switch_timer_v2): support Deta device
Add optional entities for child lock, initial state, light mode and inching.
As they are optional, they should not affect other devices without them, but
they improve matching for devices with them, as otherwise there tend to be
more dps matched on other single switch configs, as the second switch and
timer only account for 2 dps, while these account for up to 4.
Discussion #4233