native/std: restrint amount of items in JSON deserialization

[fyrchik]

Close #2104 .

Signed-off-by: Evgeniy Stratonikov [email protected]

[codecov]

Codecov Report

Merging #2105 (bdb9748) into master (06c3dda) will increase coverage by 0.21%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #2105      +/-   ##
==========================================
+ Coverage   84.13%   84.34%   +0.21%     
==========================================
  Files         288      288              
  Lines       27050    27369     +319     
==========================================
+ Hits        22759    23085     +326     
+ Misses       3043     3027      -16     
- Partials     1248     1257       +9     

Impacted Files	Coverage Δ
pkg/vm/stackitem/json.go	96.22% <81.81%> (-0.65%)	⬇️
pkg/core/native/std.go	96.47% <100.00%> (ø)
pkg/network/server.go	73.10% <0.00%> (+0.12%)	⬆️
pkg/consensus/consensus.go	73.15% <0.00%> (+0.54%)	⬆️
pkg/core/blockchain.go	84.30% <0.00%> (+3.21%)	⬆️
pkg/services/oracle/request.go	62.50% <0.00%> (+3.26%)	⬆️
pkg/core/dao/cacheddao.go	80.95% <0.00%> (+7.10%)	⬆️
pkg/services/oracle/oracle.go	86.48% <0.00%> (+9.00%)	⬆️

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