Add ``switch.interface.created`` event to ``PORT_DESC`` handler

[cmagnobarbosa]

:octocat: Are you working on some issue? Identify the issue!

Fix https://github.com/kytos/topology/issues/158 Related: https://github.com/kytos/of_core/issues/116 Related to suggestion : https://github.com/kytos/of_core/issues/116#issuecomment-824313373

:bookmark_tabs: Description of the Change

Add new event (switch.interface.created) to handle_port_desc method. This modification is an alternative to the pull request (https://github.com/kytos/topology/pull/160).

Now PORT_DESC method generate the events kytos/of_core.switch.interface.created and switch.port.created. Before this commit, only port.created was generated in PORT_DESC.

:computer: Verification Process

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:page_facing_up: Release Notes

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