Improve managing connections to peers

[matjazv]

Description

If the number of connections exceeds the maximum allowed number of connections, some of those connections need to be closed. To manage such connections a Connection manager from libp2p may be used.

If the number of connections drops below the minimum number of connections, try to connect to some of the known peers manually without libp2p or gossipsub assistance.

To prevent an indefinite amount of time to be connected with any of non-fixed peers, randomly close connection at predefined time intervals.

Acceptance Criteria

• Number of open connections doesn't exceed the maximum allowed number of connections.
• Connections are randomly closed at predefined time intervals.
• All new code is unit tested.

Additional Information

• Connection manager