Add Peer Scoring according to Gossipsub v1.1

[namay26]

(Work in Progress)

Summary This PR introduces peer scoring configurations based on the Gossipsub v1.1 specification.

Issue : #139

Key Changes

• Added PeerState class to track topic scores for each peer, and it is initialized and managed in PubsubRouter.cs
• Introduced PeerScoreManager class, which is responsible for calculating and updating peer scores according to Gossipsub v1.1 rules
• Updated PubsubSettings.cs to include peer scoring parameters (P1–P7) as defined in the Gossipsub spec

To-Do

• Integrate PeerScoreManager into the heartbeat function for periodic score updates
• Run a pubsub connection test to validate scoring behavior
• Add comprehensive unit tests to cover various scoring scenarios