*: several Notary subsystem adjustments, part 1

[AnnaShaleva]

Changes should be in sync with neo-project/neo#2661 and neo-project/neo-modules#691.

[roman-khimov]

I think this should be split into two PRs: one that we can merge immediately (everything related to NotaryServiceFeePerKey and fixes) and one that'd be postponed until final agreement is reached (IDs mostly, but withdrawal changes too).

[codecov]

Codecov Report

Merging #2378 (992d74d) into master (8ac2658) will increase coverage by 0.09%.
The diff coverage is 90.85%.

@@            Coverage Diff             @@
##           master    #2378      +/-   ##
==========================================
+ Coverage   84.87%   84.97%   +0.09%     
==========================================
  Files         290      290              
  Lines       35930    36050     +120     
==========================================
+ Hits        30496    30632     +136     
+ Misses       4143     4119      -24     
- Partials     1291     1299       +8     

Impacted Files	Coverage Δ
pkg/core/transaction/notary_assisted.go	100.00% <ø> (ø)
pkg/rpc/client/rpc.go	81.18% <40.00%> (-0.31%)	⬇️
pkg/rpc/client/native.go	69.15% <57.14%> (-1.14%)	⬇️
pkg/core/native/native_nep17.go	86.61% <60.00%> (-0.57%)	⬇️
pkg/compiler/compiler.go	72.55% <70.00%> (-0.32%)	⬇️
pkg/compiler/debug.go	93.02% <97.64%> (+0.68%)	⬆️
cli/smartcontract/generate.go	83.33% <100.00%> (ø)
cli/smartcontract/smart_contract.go	92.53% <100.00%> (+0.04%)	⬆️
pkg/compiler/codegen.go	92.43% <100.00%> (ø)
pkg/compiler/inline.go	96.51% <100.00%> (ø)
... and 6 more

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