feat: Add OpenFeature.Extensions.Hosting package

[austindrenski]

Closes: #264

---

Related

• Evaluation Context Propagation spec#81
  • Transaction Context Propagation Proposal ofep#32
  • feat: context propagation spec#227

TODO:

• moar tests
  • evaluation context
    • IHostingEnvironment sample
  • hooks
  • providers:
    • none
    • one
    • multiple
• xml docs
• readme docs

[codecov]

Codecov Report

Attention: Patch coverage is 65.78947% with 39 lines in your changes missing coverage. Please review.

Project coverage is 90.82%. Comparing base (11a0333) to head (bcf19c4).
Report is 11 commits behind head on main.

❗ Current head bcf19c4 differs from pull request most recent head 9daa33f

Please upload reports for the commit 9daa33f to get more accurate results.

Files	Patch %	Lines
...Extensions.Hosting/OpenFeatureBuilderExtensions.cs	58.10%	29 Missing and 2 partials ⚠️
src/Shared/CallerArgumentExpressionAttribute.cs	0.00%	5 Missing ⚠️
src/Shared/Check.cs	66.66%	1 Missing and 1 partial ⚠️
...sions.Hosting/Internal/OpenFeatureHostedService.cs	93.75%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #181      +/-   ##
==========================================
- Coverage   95.40%   90.82%   -4.59%     
==========================================
  Files          27       29       +2     
  Lines        1111     1068      -43     
  Branches      120      113       -7     
==========================================
- Hits         1060      970      -90     
- Misses         34       70      +36     
- Partials       17       28      +11     

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[austindrenski]

FYI couple of known test failures:

1. DCO is intentionally broken by a temp commit containing a squash of fix: Fix ArgumentOutOfRangeException for empty hooks #187 and fix: More robust shutdown/cleanup/reset #188. Once those PRs are merged, I'll rebase and elide the temp commit.
2. dotnet-format is being weird about OpenFeatureHostedService and I'm pretty sure its just a sign that we need to migrate from the dotnet-format tool, to the new dotnet format that's baked into recent SDKs.
3. flaky unit tests: pretty sure these are all related to the async stuff, so hoping they'll be less common after chore(deps): update dependency flagsmith to v5.3.0 dotnet-sdk-contrib#184 lands, but in the meantime please just re-run the test if its failed at the time of your review.

[nbr28]

Is this PR going to be merged? I was looking forward to this capabilities with version 2.0

[toddbaert]

Is this PR going to be merged? I was looking forward to this capabilities with version 2.0

@nbr28 This is still being worked on, mostly by @askpt 🙏 . We are still planning to merge once it's completed.

[kylejuliandev]

Should .NET 7 be included as TFM? .NET 7 is out of official support

[lukas-reining]

What is the reason to go for a record and the extension methods here? I am not too deep into .NET but I have not seen that pattern formerly.

[askpt]

Superseded by #310