Adding a setting for the user to pick the port and passing it to the python process

[Christellah]

Description:

This PR adds a setting so the user can change the port the server is listening on and passing it to the debugger python process. In order to do so we use an http server that we pass to socketio, and checking if that server was correctly started on the port selected.
If the server can't be initialize and the port is in use, you can't interact with the simulator but you can still debug the code and see the the variables changing.

Type of change

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Testing:

• Try running the server on different port by changing the setting Pacifica : Debugger server port
• Try running the server on an occupied port and check that you can debug but without the simulator

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[LukeSlev]

@Christellah conflicts

[LukeSlev]

LGTM