Added notification methods

[Alopalao]

Closes #71

• Added switch links enable/disable notifications
• Added interface links enable/disable notifications

[viniarck]

@Alopalao good job how you've introduced the methods, they have very well defined responsibilities and easy to test. Overall looks good, but we'll need also to cover some points that I mentioned, thanks.

[viniarck]

Aldo, when you have a chance, please update the changelog summarizing the notification changes you're introducing. Let me know if you've also explored it locally, looks like it's almost ready to land. Thanks.

[Alopalao]

Yeah, here are the logs. I changed the log from mef_eline/handle_link_up to log.info:

kytos $> 2022-11-30 14:03:41,707 - INFO [kytos.napps.kytos/mef_eline] (thread_pool_app_1) Event handle_link_up kytos/topology.link_up
kytos $> 2022-11-30 14:03:55,061 - INFO [kytos.napps.kytos/mef_eline] (thread_pool_app_0) Event handle_link_down Link(Interface('s2-eth3', 3, Switch('00:00:00:00:00:00:00:02')), Interface('s3-eth2', 2, Switch('00:00:00:00:00:00:00:03')))

[viniarck]

When I merged #114, it auto deleted the branch that this PR depends on, I just restored it, and updated this PR to use master as base. I'll review this PR shortly.

[viniarck]

Fantastic contribution, @Alopalao