Fix MaxHeaderSize

[torao]

Description

MaxHeaderSize represents the maximum size of the Header encoded in ProtocolBuffers (ChannelID seems to be the arbitrary length, so it's treated as 'softmax'); Protobuf encodes integers with variable length, so the size isn't fixed, but the maximum value of the Proof and Round fields added in Ostracon were not calculated to this maximum value.

This PR re-adjust the MaxHeaderSize to be the maximum size that Proof and Round can take. In addition, for clarity, I leave the Tendermint constant of 626 to add/remove the size of the field we have changed for the Header.

Closes: #XXX

[codecov]

Codecov Report

Merging #530 (8cab382) into main (212d0b3) will increase coverage by 0.05%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #530      +/-   ##
==========================================
+ Coverage   66.01%   66.07%   +0.05%     
==========================================
  Files         279      279              
  Lines       38028    38028              
==========================================
+ Hits        25106    25128      +22     
+ Misses      11124    11104      -20     
+ Partials     1798     1796       -2     

Impacted Files	Coverage Δ
crypto/vrf/vrf_r2ishiguro.go	100.00% <ø> (ø)
types/block.go	77.10% <ø> (ø)
privval/socket_listeners.go	79.72% <0.00%> (-4.06%)	⬇️
privval/signer_listener_endpoint.go	88.88% <0.00%> (-2.39%)	⬇️
types/voter_set.go	85.80% <0.00%> (-0.84%)	⬇️
consensus/state.go	73.24% <0.00%> (-0.59%)	⬇️
p2p/conn/connection.go	79.80% <0.00%> (-0.58%)	⬇️
proxy/multi_app_conn.go	47.66% <0.00%> (ø)
light/client.go	61.71% <0.00%> (+0.45%)	⬆️
p2p/pex/pex_reactor.go	80.28% <0.00%> (+0.61%)	⬆️
... and 3 more