Bluetooth: Add eddystone sample

This adds a sample which implement Eddystone Configuration Service
following the spefication bellow:

https://github.com/google/eddystone/tree/master/configuration-service



Change-Id: Ia3e74d068de03ae20191534e61b2752dd2d70211
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>