Added support for open generic params and handler interfaces. Added ExecuteCommandParams<>

[david-driscoll]

Fixes #370

[codecov]

Codecov Report

Merging #479 (a1c83ab) into master (e797c15) will increase coverage by 0.06%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #479      +/-   ##
==========================================
+ Coverage   72.67%   72.73%   +0.06%     
==========================================
  Files         254      254              
  Lines       12269    12278       +9     
  Branches      838      834       -4     
==========================================
+ Hits         8917     8931      +14     
+ Misses       3352     3347       -5     

Impacted Files	Coverage Δ
...ors/Strategies/ExtensionMethodGeneratorStrategy.cs	100.00% <ø> (ø)
....Generators/Strategies/HandlerGeneratorStrategy.cs	14.51% <ø> (ø)
...tMethodGeneratorWithRegistrationOptionsStrategy.cs	48.11% <ø> (ø)
...thodGeneratorWithoutRegistrationOptionsStrategy.cs	100.00% <ø> (ø)
...eMethodGeneratorWithRegistrationOptionsStrategy.cs	1.85% <ø> (ø)
...thodGeneratorWithoutRegistrationOptionsStrategy.cs	0.00% <ø> (ø)
src/JsonRpc.Generators/Helpers.cs	64.69% <68.42%> (+0.19%)	⬆️
src/JsonRpc.Generators/Contexts/SyntaxSymbol.cs	91.66% <100.00%> (ø)
...nRpc.Generators/GenerateHandlerMethodsGenerator.cs	97.22% <100.00%> (+0.01%)	⬆️
src/JsonRpc/OutputHandler.cs	98.36% <0.00%> (+1.63%)	⬆️
... and 2 more

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