polygon/sync,p2p: chain tip block fetch improvements

[taratorio]

relates to #12182

improves p2p block fetching performance at tip by:

• fetching blocks corresponding to new block hashes event using a new method FetchBlocksBackwardsByHash instead of by number because when fetching by number the peer responds with the canonical block which in some cases may not be the same block as the hash in the new block hashes event causing us to miss adding a block to our canonical chain builder
• adds an option to override default fetcher configs related to p2p request retries, timeout, etc - at tip we want 1 sec timeout (instead of 5) when calling FetchBlockByHash and 0 retries (there will be more block events in the queue after it) to maximise performance
• adds some additional helpful logging for debugging purposes

After PR things look much better