examples: NNS update, part 4

[AnnaShaleva]

Depends on #2679 and https://github.com/nspcc-dev/neofs-contract/pull/266.

[codecov[bot]]

Codecov Report

Merging #2687 (8790602) into master (20224cb) will increase coverage by 0.24%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2687      +/-   ##
==========================================
+ Coverage   85.23%   85.47%   +0.24%     
==========================================
  Files         322      322              
  Lines       39398    39676     +278     
==========================================
+ Hits        33580    33915     +335     
+ Misses       4479     4430      -49     
+ Partials     1339     1331       -8     

Impacted Files	Coverage Δ
pkg/network/message.go	94.02% <0.00%> (-1.50%)	:arrow_down:
pkg/services/stateroot/network.go	76.71% <0.00%> (-0.32%)	:arrow_down:
pkg/network/server.go	72.99% <0.00%> (-0.26%)	:arrow_down:
pkg/services/oracle/response.go	84.80% <0.00%> (-0.24%)	:arrow_down:
pkg/neorpc/errors.go	69.69% <0.00%> (ø)
pkg/rpcclient/nep11.go	0.00% <0.00%> (ø)
pkg/consensus/crypto.go	100.00% <0.00%> (ø)
pkg/rpcclient/policy.go	65.38% <0.00%> (ø)
pkg/util/slice/array.go	100.00% <0.00%> (ø)
pkg/rpcclient/gas/gas.go	100.00% <0.00%> (ø)
... and 42 more

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