Drop deprecated things

[roman-khimov]

The time has come.

[codecov]

Codecov Report

Merging #3150 (9b8c412) into master (cef7009) will increase coverage by 0.58%.
Report is 2 commits behind head on master.
The diff coverage is 87.87%.

❗ Current head 9b8c412 differs from pull request most recent head 460362a. Consider uploading reports for the commit 460362a to get more accurate results

@@            Coverage Diff             @@
##           master    #3150      +/-   ##
==========================================
+ Coverage   84.86%   85.45%   +0.58%     
==========================================
  Files         330      323       -7     
  Lines       44337    43551     -786     
==========================================
- Hits        37628    37217     -411     
+ Misses       5198     4867     -331     
+ Partials     1511     1467      -44     

Files	Coverage Δ
cli/server/server.go	68.37% <ø> (-0.54%)	⬇️
cli/wallet/nep17.go	74.31% <100.00%> (ø)
pkg/config/application_config.go	84.61% <100.00%> (-7.83%)	⬇️
pkg/config/config.go	83.33% <ø> (-1.67%)	⬇️
pkg/config/protocol_config.go	90.90% <100.00%> (-0.48%)	⬇️
pkg/network/server_config.go	89.28% <100.00%> (+37.81%)	⬆️
pkg/rpcclient/client.go	86.56% <ø> (ø)
pkg/rpcclient/local.go	87.23% <100.00%> (-0.53%)	⬇️
pkg/rpcclient/rpc.go	86.06% <100.00%> (+3.35%)	⬆️
pkg/rpcclient/wsclient.go	74.40% <100.00%> (-0.68%)	⬇️
... and 4 more

... and 9 files with indirect coverage changes

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[AnnaShaleva]

A lot of changes await the NeoFS and neo-bench.