Convert code samples to executable code

Docfx has the ability to pull snippets from other files, including directly from C# code.

This means we can create a real solution/project, host code samples there and iterate on them, and pull the relevant sections into the docs.

Doing this will allow for:

• Verification of sample code
• Easier refactoring of samples to use good practices
• CI checking to ensure samples work and all tests pass
• Ability to show tests that fail too (and to ignore them in CI)
• Easier creation of more complex samples
• Sample code re-use eventually

Work Breakdown

• #702
• Comb the project for other possible snippets and add them to the list here
• Enlist others in populating these snippets in the real project

Snippets, in suggested order of priority:

TBD

Start by reviewing the completed work in #702 and the existing Docfx snippets, then comb the project for additional snippets as requested in the work breakdown. Done means prioritized samples are hosted in a real C# solution or project, pulled into the documentation, and checked by CI where applicable.