rpc/request: support passing accounts as addresses

[roman-khimov]

Turns out, it's completely legal in C#, see neo-project/neo#2543.

[codecov]

Codecov Report

Merging #2072 (a617390) into master (0023c4f) will increase coverage by 16.58%.
The diff coverage is 81.87%.

@@             Coverage Diff             @@
##           master    #2072       +/-   ##
===========================================
+ Coverage   67.65%   84.24%   +16.58%     
===========================================
  Files         141      287      +146     
  Lines       13163    26904    +13741     
===========================================
+ Hits         8906    22665    +13759     
+ Misses       3849     3010      -839     
- Partials      408     1229      +821     

Impacted Files	Coverage Δ
cli/vm/vm.go	60.00% <0.00%> (ø)
pkg/compiler/codegen.go	93.29% <ø> (+5.34%)	⬆️
pkg/compiler/compiler.go	73.88% <ø> (+11.38%)	⬆️
pkg/compiler/debug.go	93.67% <ø> (ø)
pkg/compiler/func_scope.go	100.00% <ø> (ø)
pkg/compiler/inline.go	97.01% <ø> (ø)
pkg/compiler/types.go	85.96% <ø> (ø)
pkg/compiler/vars.go	90.90% <ø> (ø)
pkg/config/config.go	76.92% <ø> (ø)
pkg/config/netmode/netmode.go	83.33% <ø> (ø)
... and 360 more

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