SignalR Session Management

[rbaker26]

Description

This PR adds SignalR functionality to the app.
This will allow the Server to issue a callback to the Client when SAP2 Emulation is ready for more input or is complete.

Motivation and Context

Resolves #153

How Has This Been Tested?

Using SSMS (see screenshots)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added unit and integration tests to cover my changes.
• All new and existing tests passed.
• I updated the SamVer in the appropriate .csproj file (only for to-master-merges, ask rbaker26 for a release number).

[codecov-io]

Codecov Report

Merging #168 (4d58dd1) into v4.0.0-rc (ba32ca4) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           v4.0.0-rc     #168   +/-   ##
==========================================
  Coverage      87.13%   87.13%           
==========================================
  Files             28       28           
  Lines           1275     1275           
==========================================
  Hits            1111     1111           
  Misses           164      164           

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[github-actions]

BenchmarkDotNet=v0.12.1, OS=ubuntu 18.04
Intel Xeon CPU E5-2673 v4 2.30GHz, 1 CPU, 2 logical and 2 physical cores
.NET Core SDK=3.1.404
  [Host]     : .NET Core 3.1.10 (CoreCLR 4.700.20.51601, CoreFX 4.700.20.51901), X64 RyuJIT
  DefaultJob : .NET Core 3.1.10 (CoreCLR 4.700.20.51601, CoreFX 4.700.20.51901), X64 RyuJIT

Method	Mean	Error	StdDev	Ratio	RatioSD
EngineRun_HLT	157.0 μs	3.11 μs	4.55 μs	1.00	0.00
EngineRun_LDA170	177.4 μs	3.54 μs	4.60 μs	1.13	0.05
EngineRun_FIB5	917.9 μs	17.85 μs	17.53 μs	5.89	0.20