[RFC] Add new method to DBus API: DiscoverServiceByUUID

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Currently, calling org.bluez.Device1.Connect() on a new, never
connected before device, would cause automatic discovery of all
services.

This is bad in some cases, because discovering all available services
might take a long time. Additionally some devices, i.e. iPhone have
built-in 0.5s delay between each "Find Information Response" packet,
which make discovery even longer.


I would like to propose following change:

1. Calling org.bluez.Device1.Connect() would work just like now,
except no "Find Information Request" would be issued (that means no
call to "device_browse_gatt").

2. Add two new methods: org.bluez.Device1.DiscoverServices(), and
org.bluez.Device1.DiscoverServiceByUUID(uuid). First one would just
call device_browse_gatt and make "Find Information Request" , the
second one would issue "Find By Type Value Request" to find just one
service.
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