Don't clear tx pool on epoch transitions, add txsync protocol

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #4579 (d2c2489) into master (afabfc6) will increase coverage by 0.17%.
The diff coverage is 71.65%.

❗ Current head d2c2489 differs from pull request most recent head b2f9626. Consider uploading reports for the commit b2f9626 to get more accurate results

@@            Coverage Diff             @@
##           master    #4579      +/-   ##
==========================================
+ Coverage   66.86%   67.03%   +0.17%     
==========================================
  Files         424      427       +3     
  Lines       48069    48115      +46     
==========================================
+ Hits        32141    32256     +115     
+ Misses      11982    11925      -57     
+ Partials     3946     3934      -12     

Impacted Files	Coverage Δ
go/worker/common/p2p/rpc/client.go	78.65% <41.66%> (-2.68%)	⬇️
go/worker/common/p2p/txsync/client.go	58.33% <58.33%> (ø)
go/runtime/txpool/txpool.go	78.81% <66.66%> (+2.19%)	⬆️
go/worker/common/p2p/txsync/server.go	69.23% <69.23%> (ø)
.../worker/compute/executor/committee/transactions.go	82.69% <82.69%> (ø)
go/worker/common/committee/node.go	68.60% <100.00%> (+0.67%)	⬆️
go/worker/common/config.go	72.91% <100.00%> (-1.09%)	⬇️
go/worker/compute/executor/committee/node.go	71.27% <100.00%> (-0.21%)	⬇️
go/worker/common/committee/p2p.go	70.00% <0.00%> (-10.00%)	⬇️
go/worker/common/p2p/dispatch.go	71.52% <0.00%> (-5.56%)	⬇️
... and 34 more

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