network: Add peers state metrics

[sanlee42]

No description provided.

[codecov]

Codecov Report

Merging #2980 (73fc19a) into master (f559cff) will decrease coverage by 0.02%.
The diff coverage is 56.00%.

@@            Coverage Diff             @@
##           master    #2980      +/-   ##
==========================================
- Coverage   33.19%   33.18%   -0.01%     
==========================================
  Files         515      515              
  Lines       45662    45688      +26     
  Branches    20812    20825      +13     
==========================================
  Hits        15155    15155              
- Misses      16055    16154      +99     
+ Partials    14452    14379      -73     

Flag	Coverage Δ
unittests	33.18% <56.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
network-p2p/src/metrics.rs	4.38% <0.00%> (-0.16%)	⬇️
network-p2p/src/service.rs	30.29% <45.46%> (-0.80%)	⬇️
network-p2p/peerset/src/lib.rs	42.56% <100.00%> (+0.59%)	⬆️
network-p2p/src/protocol.rs	41.56% <100.00%> (+1.29%)	⬆️
...etwork-p2p/src/protocol/generic_proto/behaviour.rs	21.38% <100.00%> (+0.22%)	⬆️
rpc/server/src/module/mod.rs	0.00% <0.00%> (-16.84%)	⬇️
vm/types/src/transaction/error.rs	3.93% <0.00%> (-15.68%)	⬇️
executor/src/block_executor.rs	26.67% <0.00%> (-11.11%)	⬇️
storage/src/transaction_info/mod.rs	39.40% <0.00%> (-9.09%)	⬇️
storage/src/block/mod.rs	51.10% <0.00%> (-5.83%)	⬇️
... and 73 more

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