Add timeout while synchronizing head blocks

[leventeliu]

No description provided.

[codecov]

Codecov Report

Merging #352 into develop will decrease coverage by 0.09%.
The diff coverage is 79.62%.

@@            Coverage Diff             @@
##           develop     #352     +/-   ##
==========================================
- Coverage    80.61%   80.51%   -0.1%     
==========================================
  Files          174      174             
  Lines        12347    12388     +41     
==========================================
+ Hits          9953     9974     +21     
- Misses        1658     1676     +18     
- Partials       736      738      +2

Impacted Files	Coverage Δ
rpc/mux/rawcaller.go	82.35% <0%> (ø)	⬆️
worker/db.go	65.65% <0%> (-0.85%)	⬇️
naconn/conn.go	68.13% <100%> (ø)	⬆️
sqlchain/runtime.go	79.14% <100%> (+1.21%)	⬆️
crypto/etls/conn.go	77.77% <100%> (+4.76%)	⬆️
sqlchain/chain.go	73.07% <79.78%> (-1.82%)	⬇️
utils/net.go	93.33% <0%> (-4%)	⬇️
sqlchain/mux.go	58.82% <0%> (-2.95%)	⬇️
client/conn.go	70.68% <0%> (-0.41%)	⬇️
... and 1 more

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