Add PeerChainState

[earlbread]

This adds PeerChainStatus struct and Swarm<T>.GetPeerChainStatus() method to check the chain status of the connected peers.

[codecov]

Codecov Report

Merging #936 into master will increase coverage by 0.02%.
The diff coverage is 89.65%.

@@            Coverage Diff             @@
##           master     #936      +/-   ##
==========================================
+ Coverage   87.97%   88.00%   +0.02%     
==========================================
  Files         263      264       +1     
  Lines       24200    24258      +58     
==========================================
+ Hits        21291    21349      +58     
+ Misses       1504     1502       -2     
- Partials     1405     1407       +2     

Impacted Files	Coverage Δ
Libplanet/Net/PeerChainState.cs	45.45% <45.45%> (ø)
Libplanet.Tests/Net/SwarmTest.cs	94.84% <100.00%> (+0.14%)	⬆️
Libplanet/Net/Swarm.cs	86.03% <100.00%> (+0.05%)	⬆️
Libplanet/Store/DefaultStore.cs	86.39% <0.00%> (+0.94%)	⬆️

[earlbread]

I changed an Array to a HashSet to fix the flaky test. 945d6d3

[dahlia]

How about renaming PeerChainStatus to PeerChainState? Cf. https://english.stackexchange.com/questions/12958/status-vs-state. /cc @planetarium/libplanet

[earlbread]

How about renaming PeerChainStatus to PeerChainState? Cf. https://english.stackexchange.com/questions/12958/status-vs-state. /cc @planetarium/libplanet

I think that's good. I'll rename it.

[limebell]

Currently, Swarm<T>.DialToExistingPeers returns Task<(BoundPeer, ChainStatus)> as its return type. How about merge PeerChainState struct and ChainStatus (and make it public)? Then we can just use Task<PeerChainState> as the method's return type.

[earlbread]

Currently, Swarm<T>.DialToExistingPeers returns Task<(BoundPeer, ChainStatus)> as its return type. How about merge PeerChainState struct and ChainStatus (and make it public)? Then we can just use Task<PeerChainState> as the method's return type.

I thought about it at first, but to do that, the current internal Message class should be public. Is it okay?

[limebell]

Currently, Swarm<T>.DialToExistingPeers returns Task<(BoundPeer, ChainStatus)> as its return type. How about merge PeerChainState struct and ChainStatus (and make it public)? Then we can just use Task<PeerChainState> as the method's return type.

I thought about it at first, but to do that, the current internal Message class should be public. Is it okay?

OH I made mistake, you're right.