Add NewLineDelimitedMessageHandler

[AArnott]

This new handler delimites JSON-RPC messages simply by a new line character.
I've heard of a few such JSON-RPC protocol implementations, which makes sense because people can simply type or paste a JSON-RPC message into a terminal and press enter and it will be processed.

[AArnott]

@Lugghawk Can you try this and confirm it works for you? That would be some great validation to justify completing the PR.

[codecov-io]

Codecov Report

Merging #404 into v2.3 will increase coverage by 0.06%.
The diff coverage is 86.79%.

@@            Coverage Diff             @@
##             v2.3     #404      +/-   ##
==========================================
+ Coverage   90.56%   90.63%   +0.06%     
==========================================
  Files          48       49       +1     
  Lines        3668     3705      +37     
==========================================
+ Hits         3322     3358      +36     
- Misses        346      347       +1

Impacted Files	Coverage Δ
src/StreamJsonRpc/Resources.Designer.cs	66.19% <0%> (-0.95%)	⬇️
...rc/StreamJsonRpc/NewLineDelimitedMessageHandler.cs	88.46% <88.46%> (ø)
src/StreamJsonRpc/WebSocketMessageHandler.cs	97.36% <0%> (+10.33%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 11e6ca6...ffab450. Read the comment docs.

[Lugghawk]

Hey, I pulled down the link you had sent me (https://dev.azure.com/azure-public/vside/_build/results?buildId=8136&view=artifacts&type=publishedArtifacts) and installed it, and configured the new handler.

This is now working with my newline-delimited service, and lets me test out my client with nc by pasting in responses/requests.

Thanks!