Feature/unified solution

[alexhiggins732]

• Add a single solution containing all projects to allow for scanning, dependency management, and analysis of all projects within a single solution.
• Refactors client samples to use a shared Identity Server implementation to eliminate unnecessary code duplication.

[codecov]

Codecov Report

❌ Patch coverage is 85.47486% with 78 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.68%. Comparing base (0320ceb) to head (5dbf5e5).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s/Quickstarts/Shared/src/IdentityServer/Program.cs	0.00%	39 Missing ⚠️
.../Quickstarts/6_AspNetIdentity/src/Host/SeedData.cs	77.19%	7 Missing and 6 partials ⚠️
...entityServer/Quickstart/HttpContextSignInHelper.cs	62.50%	7 Missing and 2 partials ⚠️
...ckstarts/5_EntityFramework/src/Host/StartupTest.cs	93.54%	4 Missing and 2 partials ⚠️
...spNetIdentity/src/Host/Models/SignManagerHelper.cs	82.35%	2 Missing and 1 partial ⚠️
...ickstarts/6_AspNetIdentity/src/Host/StartupTest.cs	95.16%	2 Missing and 1 partial ⚠️
...er/Quickstart/Diagnostics/DiagnosticsController.cs	0.00%	0 Missing and 2 partials ⚠️
...tityServer/Quickstart/Account/AccountController.cs	83.33%	1 Missing ⚠️
.../Shared/src/IdentityServer/Views/Home/Index.cshtml	0.00%	0 Missing and 1 partial ⚠️
...ed/src/IdentityServer/Views/Shared/Redirect.cshtml	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (0320ceb) and HEAD (5dbf5e5). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (0320ceb)	HEAD (5dbf5e5)
	3	1

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #37      +/-   ##
===========================================
- Coverage    78.87%   69.68%   -9.19%     
===========================================
  Files          373      504     +131     
  Lines        10233    13473    +3240     
  Branches      1512     1986     +474     
===========================================
+ Hits          8071     9389    +1318     
- Misses        1726     3610    +1884     
- Partials       436      474      +38     

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