rpcsrv: add hardforks to getversion response

[AnnaShaleva]

Port neo-project/neo-modules#823.

[codecov]

Codecov Report

Merging #3160 (8672952) into master (b284b90) will increase coverage by 0.00%.
Report is 14 commits behind head on master.
The diff coverage is 89.65%.

❗ Current head 8672952 differs from pull request most recent head 69a0104. Consider uploading reports for the commit 69a0104 to get more accurate results

@@           Coverage Diff           @@
##           master    #3160   +/-   ##
=======================================
  Coverage   85.36%   85.37%           
=======================================
  Files         323      323           
  Lines       43574    43603   +29     
=======================================
+ Hits        37198    37227   +29     
  Misses       4915     4915           
  Partials     1461     1461           

Files	Coverage Δ
pkg/services/rpcsrv/server.go	80.89% <100.00%> (+0.04%)	⬆️
pkg/neorpc/result/version.go	95.08% <86.36%> (-4.92%)	⬇️

... and 15 files with indirect coverage changes

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