feat: Add Dependency Injection and Hosting support

[toddbaert]

temp

[codecov]

Codecov Report

Attention: Patch coverage is 46.69421% with 129 lines in your changes missing coverage. Please review.

Project coverage is 85.75%. Comparing base (ccf0250) to head (0054f91).

Files with missing lines	Patch %	Lines
...ependencyInjection/OpenFeatureBuilderExtensions.cs	43.51%	71 Missing and 3 partials ⚠️
...njection/OpenFeatureServiceCollectionExtensions.cs	54.54%	14 Missing and 1 partial ⚠️
...dencyInjection/Internal/FeatureLifecycleManager.cs	62.50%	8 Missing and 1 partial ⚠️
...ction/Providers/Memory/FeatureBuilderExtensions.cs	0.00%	9 Missing ⚠️
...nFeature.DependencyInjection/OpenFeatureOptions.cs	58.82%	6 Missing and 1 partial ⚠️
src/OpenFeature.DependencyInjection/Guard.cs	25.00%	5 Missing and 1 partial ⚠️
...nFeature.DependencyInjection/OpenFeatureBuilder.cs	64.70%	4 Missing and 2 partials ⚠️
...ection/Providers/Memory/InMemoryProviderFactory.cs	0.00%	2 Missing ⚠️
...enFeature.DependencyInjection/PolicyNameOptions.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   94.19%   85.75%   -8.45%     
==========================================
  Files          25       34       +9     
  Lines        1120     1362     +242     
  Branches      123      147      +24     
==========================================
+ Hits         1055     1168     +113     
- Misses         42      162     +120     
- Partials       23       32       +9     

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