feat: Layered context

[chrfwow]

Introduces layered context to reduce memory churn

#1718

[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 62.62626% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.40%. Comparing base (060dd41) to head (854b29f).
⚠️ Report is 44 commits behind head on main.

Files with missing lines	Patch %	Lines
.../dev/openfeature/sdk/LayeredEvaluationContext.java	60.22%	21 Missing and 14 partials ⚠️
src/main/java/dev/openfeature/sdk/HookSupport.java	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1717      +/-   ##
============================================
- Coverage     91.69%   91.40%   -0.29%     
- Complexity      517      550      +33     
============================================
  Files            51       53       +2     
  Lines          1264     1362      +98     
  Branches        112      132      +20     
============================================
+ Hits           1159     1245      +86     
- Misses           68       71       +3     
- Partials         37       46       +9     

Flag	Coverage Δ
unittests	91.40% <62.62%> (-0.29%)	⬇️

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