p2p: Add algod_network_p2p_* traffic metrics

[algorandskiy]

Summary

This is a part 2 of the P2P metrics enhancement (followup to the #6104)

• Moded wsNetwork and wsPeer metrics to network/metrics.go since they now also p2p metrics
• Added algod_network_p2p_received_bytes_{TAG}, algod_network_p2p_sent_bytes_{TAG}, algod_network_p2p_message_sent_{TAG}, algod_network_p2p_message_received_{TAG}
• wsPeer now increments algod_network_p2p_ or algod_network_ counters based on a node type.
• pubsubMetricsTracer increments *_TX counters.

pubsubMetricsTracer has hardcoded TX to TXTopicName mapping because of these reasons:

1. Comparison against a string constant *rpc.Publish[i].Topic == TXTopicName is optimized down to two comparison instructions: length and data (given the topic name is 8 bytes).

Test Plan

• Tested locally with goal network + pingpong + test/heapwatch/heapWatch.py --period 10 --metrics and observed

algod_network_p2p_received_bytes_TX 21116548
algod_network_p2p_sent_bytes_TX 58485052
algod_network_p2p_message_sent_TX 17812
algod_network_p2p_message_received_TX 6730

• Tested with algonet to get P2P vs WS bandwidth numbers.

[codecov]

Codecov Report

Attention: Patch coverage is 71.59091% with 25 lines in your changes missing coverage. Please review.

Project coverage is 56.30%. Comparing base (8e2e2e4) to head (edc2d0c).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
network/metrics.go	65.51%	20 Missing ⚠️
network/p2p/pubsub.go	0.00%	3 Missing ⚠️
network/p2p/p2p.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6105      +/-   ##
==========================================
+ Coverage   56.22%   56.30%   +0.08%     
==========================================
  Files         490      490              
  Lines       69705    69746      +41     
==========================================
+ Hits        39191    39271      +80     
+ Misses      27840    27809      -31     
+ Partials     2674     2666       -8     

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