[homekit] allow group items of the correct type anywhere that type is needed (#13236)

[homekit] allow group items of the correct type anywhere that type is needed (#13236)

this is a theme, and I've extracted a helper method and applied it to several
other locations as well

example, I have a double-sliding door, with two contact sensors
in the alarm system, defined as:

```
Group:Contact:AND(CLOSED,OPEN) DeckDoor_Contact "Deck Door [%s]" <door> (gExteriorDoors, gWarningVisibility_Contact, gDoor, lMainFloor, gInflux) { homekit="ContactSensor" [instance=2] }
Contact DeckNDoor_Contact "Deck Door North" <door> (gInflux, DeckDoor_Contact, gGreatContacts) { channel="dscalarm:zone:46c52f35:zone11:zone_status" }
Switch DeckNDoor_Tamper "Deck Door North Tamper [%s]" <warning> (gTamper, gWarningVisibility_Switch) { channel="dscalarm:zone:46c52f35:zone11:zone_tamper" }
Contact DeckSDoor_Contact "Deck Door South" <door> (gInflux, DeckDoor_Contact, gGreatContacts) { channel="dscalarm:zone:46c52f35:zone12:zone_status" }
Switch DeckSDoor_Tamper "Deck Door South Tamper [%s]" <warning> (gTamper, gWarningVisibility_Switch) { channel="dscalarm:zone:46c52f35:zone12:zone_tamper" }
```

This allows the Group:Contact to be used for the ContactSensor.

Signed-off-by: Cody Cutrer <cody@cutrer.us>