Activate Swagger endpoint

[kbeaugrand]

Description

What's new?

• Activate swagger endpoint with Swashbuckle

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

[codecov]

Codecov Report

Merging #246 (6192c12) into main (0078fab) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #246      +/-   ##
==========================================
- Coverage   20.41%   20.36%   -0.05%     
==========================================
  Files          77       77              
  Lines        2273     2278       +5     
==========================================
  Hits          464      464              
- Misses       1809     1814       +5     

Impacted Files	Coverage Δ
src/AzureIoTHub.Portal/Server/Startup.cs	0.00% <0.00%> (ø)

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