feat(multiprovider): execute child provider hooks during evaluation

[jonathannorris]

Summary

• Hooks registered on a child provider now run around that child's evaluation, so a wrapped provider's own hooks observe the evaluations they take part in.
• Adds MultiProviderHookExecutor, which runs the before/after/error/finally stages per child, mirroring the JS SDK's HookExecutor.
• before hooks run in registration order; after, error, and finallyAfter run in reverse, per spec.
• MultiProvider exposes a provider-level hook that captures the ClientMetadata and hook hints from the SDK lifecycle so they can be passed into child hook contexts. This mirrors the JS SDK's WeakMap approach; here it's a ThreadLocal snapshot captured before the strategy runs, so parallel strategies work correctly.

Related PRs

This is one of three independent PRs that together close the multi-provider gaps identified in #1882. They branch off main separately and can be reviewed and merged in any order. Together they replace #1897.

• feat(multiprovider): add ComparisonStrategy #2003 ComparisonStrategy
• feat(multiprovider): aggregate child provider events, state, and tracking #2004 child provider event aggregation, state, and tracking
• feat(multiprovider): execute child provider hooks during evaluation #2005 child provider hook execution (this PR)

Relates to #1882

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[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 91.37931% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.92%. Comparing base (a8e6644) to head (b242156).

Files with missing lines	Patch %	Lines
...e/sdk/multiprovider/MultiProviderHookExecutor.java	90.51%	6 Missing and 7 partials ⚠️
...v/openfeature/sdk/multiprovider/MultiProvider.java	93.93%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2005      +/-   ##
============================================
+ Coverage     92.52%   92.92%   +0.40%     
- Complexity      728      774      +46     
============================================
  Files            60       62       +2     
  Lines          1739     1908     +169     
  Branches        202      218      +16     
============================================
+ Hits           1609     1773     +164     
+ Misses           80       79       -1     
- Partials         50       56       +6     

Flag	Coverage Δ
unittests	92.92% <91.37%> (+0.40%)	⬆️

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