Provide additional interface or annotation "Daemon" or "Singleton"

[watarhu]

The idea is that with this interface or annotation detected in the adapter or implementation the service repository treat itself as singleton automatically.

[watarhu]

Its not necessary to convert to singleton any daemon, should be better to interpret that a runnable that it's singleton should be started at the beginning by this way you could start a daemon without so much complication,

[watarhu]

From #26 (Add annotation to indicate if the service is or not threadsafe to check possible problems), that proposes a similar problem but with alternative solution:

• Add annotation (for example @ThreadSafe/@threadunsafe) in order to have some flag to control if some service is prepared to be a singleton.
• If the annotation @threadunsafe is found then a warning should be printed in log to warning that use as singleton can create unexpected results.