Add support for dynamic proxies with non-public interfaces

[AArnott]

Fixes #236

[codecov-io]

Codecov Report

Merging #342 into master will increase coverage by 0.22%.
The diff coverage is 86.86%.

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
+ Coverage   87.63%   87.85%   +0.22%     
==========================================
  Files          34       35       +1     
  Lines        2281     2364      +83     
  Branches      441      454      +13     
==========================================
+ Hits         1999     2077      +78     
- Misses        214      216       +2     
- Partials       68       71       +3

Impacted Files	Coverage Δ
src/StreamJsonRpc/SkipClrVisibilityChecks.cs	84.5% <84.5%> (ø)
src/StreamJsonRpc/ProxyGeneration.cs	98.02% <92.85%> (+0.42%)	⬆️
src/StreamJsonRpc/JsonRpc.cs	91.43% <0%> (+0.12%)	⬆️
...treamJsonRpc/Exceptions/ConnectionLostException.cs	75% <0%> (+25%)	⬆️
src/StreamJsonRpc/Exceptions/RemoteRpcException.cs	66.66% <0%> (+33.33%)	⬆️

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