Feature Flags based on OpenFeature Specs

[sarbagya-acme]

More about the specs at: https://openfeature.dev

The coverage for some of the OpenFeature files are ignored, as there are some pending feature to be refined as per the spec, which will be done in follow up PRs.

[sarbagya-acme]

Working on fixing tests.

[codecov]

Codecov Report

Merging #70 (9a746d5) into develop (d2ddca0) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #70      +/-   ##
===========================================
+ Coverage    97.62%   97.74%   +0.12%     
===========================================
  Files           69       81      +12     
  Lines         1345     1510     +165     
===========================================
+ Hits          1313     1476     +163     
- Misses          32       34       +2     

Impacted Files	Coverage Δ
example/lib/asset_feature_provider.dart	100.00% <100.00%> (ø)
example/lib/home_page.dart	100.00% <100.00%> (ø)
example/lib/main.dart	100.00% <100.00%> (ø)
...ts/feature_provider/engine/open_feature_flags.dart	100.00% <100.00%> (ø)
...faults/feature_provider/json_feature_provider.dart	100.00% <100.00%> (ø)
...c/open_feature/src/core/enums/flag_value_type.dart	100.00% <100.00%> (ø)
lib/src/open_feature/src/core/enums/reason.dart	100.00% <100.00%> (ø)
lib/src/open_feature/src/core/features.dart	100.00% <100.00%> (ø)
.../src/open_feature/src/core/resolution_details.dart	100.00% <100.00%> (ø)
...ure/src/evaluation_context/evaluation_context.dart	100.00% <100.00%> (ø)
... and 6 more

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