metrics: collect total netdev sent/received bytes

[algorandskiy]

Summary

Expose total number of bytes sent/received on network interfaces. This is similar to node_exporter data but works without node_exporter. It is gated behind the EnableNetDevMetrics new config option.

Test Plan

Tested locally on both MacOS and Linux

# HELP algod_netdev_received_bytes Bytes received
# TYPE algod_netdev_received_bytes counter
algod_netdev_received_bytes{iface="lo0"} 1085390848
algod_netdev_received_bytes{iface="ap1"} 0
algod_netdev_received_bytes{iface="en0"} 1231844352
algod_netdev_received_bytes{iface="awdl0"} 2465792
algod_netdev_received_bytes{iface="utun0"} 0
algod_netdev_received_bytes{iface="utun1"} 0
algod_netdev_received_bytes{iface="utun2"} 0
# HELP algod_netdev_sent_bytes Bytes sent
# TYPE algod_netdev_sent_bytes counter
algod_netdev_sent_bytes{iface="lo0"} 1085390848
algod_netdev_sent_bytes{iface="ap1"} 3752960
algod_netdev_sent_bytes{iface="en0"} 1833891840
algod_netdev_sent_bytes{iface="awdl0"} 28672
algod_netdev_sent_bytes{iface="utun0"} 2048
algod_netdev_sent_bytes{iface="utun1"} 2048
algod_netdev_sent_bytes{iface="utun2"} 2048

We also have some tools to render and summarize these tagged metrics:

python3 test/heapwatch/metrics_aggs.py -d metrics/500x15 '--nick-re=name_r\d+' algod_netdev_sent_bytes -s html -t iface=ens5 --avg-max-min

Or non-tagged ones to CVS

python3 /bdevscripts/metric_csv.py metrics/500x15 algod_network_p2p_received_bytes_total relay | tail -1 | awk -F',' '{for(i=1;i<=NF;i++) sum+=$i; printf "%d\n", sum/NF}'

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 70 lines in your changes missing coverage. Please review.

Project coverage is 56.19%. Comparing base (8e2e2e4) to head (a20f4ee).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
util/metrics/netdev_common.go	0.00%	37 Missing ⚠️
util/metrics/netdev_linux.go	0.00%	31 Missing ⚠️
daemon/algod/server.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6108      +/-   ##
==========================================
- Coverage   56.22%   56.19%   -0.04%     
==========================================
  Files         490      492       +2     
  Lines       69705    69775      +70     
==========================================
+ Hits        39191    39207      +16     
- Misses      27840    27898      +58     
+ Partials     2674     2670       -4     

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