examples: add NFT example, fix #1845

[roman-khimov]

No description provided.

[codecov]

Codecov Report

Merging #1891 (f21f506) into master (d33dcd5) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1891      +/-   ##
==========================================
+ Coverage   82.82%   82.91%   +0.09%     
==========================================
  Files         287      287              
  Lines       22772    22782      +10     
==========================================
+ Hits        18860    18889      +29     
+ Misses       2718     2696      -22     
- Partials     1194     1197       +3     

Impacted Files	Coverage Δ
pkg/core/interop/runtime/engine.go	100.00% <0.00%> (ø)
pkg/network/server.go	70.94% <0.00%> (+0.14%)	⬆️
pkg/core/interop_neo.go	94.11% <0.00%> (+0.78%)	⬆️
pkg/services/oracle/request.go	53.23% <0.00%> (+5.75%)	⬆️
pkg/services/oracle/oracle.go	90.90% <0.00%> (+11.36%)	⬆️

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