Fix removal of disconnected peers in the peer manager

[Alex6323]

Description of change

• Improves detection of a valid connection by making use of libp2p identify protocol;
• Fixes notification of removed peers in bee-gossip so that the peer manager in bee-protocol removes all disconnected peers appropriatedly;
• Improves logs;

Links to any relevant issues

Fixes #1143

Type of change

• Enhancement (a non-breaking change which adds functionality)
• Bug fix (a non-breaking change which fixes an issue)

How the change has been tested

VPS

Change checklist

• I have followed the contribution guidelines for 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
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes
• I have updated the CHANGELOG.md, if my changes are significant enough