Return correct account count in hubble_getNetworkInfo result

[max-sidorov]

No description provided.

[msieczko]

Cache the number of accounts in Storage and update it on Set operations

[codecov-commenter]

Codecov Report

Merging #594 (15d4f73) into master (78492d0) will increase coverage by 0.01%.
The diff coverage is 73.84%.

@@            Coverage Diff             @@
##           master     #594      +/-   ##
==========================================
+ Coverage   61.82%   61.84%   +0.01%     
==========================================
  Files         281      281              
  Lines       13238    13281      +43     
==========================================
+ Hits         8185     8213      +28     
- Misses       4235     4247      +12     
- Partials      818      821       +3     

Flag	Coverage Δ
build-test	61.84% <73.84%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
storage/storage.go	79.38% <40.00%> (-2.34%)	⬇️
storage/state_tree.go	62.73% <76.27%> (+0.81%)	⬆️
api/get_network_info.go	71.42% <100.00%> (+2.67%)	⬆️

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