Add DocFx Integration

[ProjectsByJackHe]

Description

While working on supporting a new experimental feature (RELIABLE_RESET) #3817

It became apparent how painful it is digging through docs on markdown.

Additionally, ChatGPT has little context and starts hallucinating and giving downright wrong answers due to a mixture of poor indexing and incomplete documentation in its training set.

To spearhead the effort to improve GPT integration, search engine indexing, and just having a nice searching feature (with built-in indexing), while minimizing the amount of work, DocFx fits our requirements perfectly.

A preview of DocFx is live here: https://projectsbyjackhe.github.io/MsQuicDocFx/docs/API.html
(Try out the search feature on the top right bar 💯)

Testing

N/A

Documentation

Yes! In fact, you can check out a preview here: https://projectsbyjackhe.github.io/MsQuicDocFx/docs/API.html

[codecov]

Codecov Report

Merging #3833 (193d918) into main (f91ccc2) will decrease coverage by 0.09%.
Report is 16 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3833      +/-   ##
==========================================
- Coverage   86.56%   86.47%   -0.09%     
==========================================
  Files          56       56              
  Lines       16596    16693      +97     
==========================================
+ Hits        14366    14435      +69     
- Misses       2230     2258      +28     

see 23 files with indirect coverage changes

[ProjectsByJackHe]

Note: Publishing DocFx Workflow will use actions/setup-dotnet@3447fd6a9f9e57506b15f895c5b76d3b197dc7c2 Which is part of release V3.2.0: https://github.com/actions/setup-dotnet/releases/tag/v3.2.0