address: add public information to the stringified value

This affect the way security keys are stored. For instance the same
key can be used both as public and random, and it need to be stored
separately one from each other.

bumble/hci.py

@@ -1753,7 +1753,10 @@ class Address:
         '''
         String representation of the address, MSB first
         '''
-        return ':'.join([f'{x:02X}' for x in reversed(self.address_bytes)])
+        str = ':'.join([f'{x:02X}' for x in reversed(self.address_bytes)])
+        if not self.is_public:
+            return str
+        return str + '/P'
 
 
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