fix: validate list content to be values

[Kavindu-Dodan]

This PR

Fixes #286

Value.isList() now validate list internal objects to be Value typed

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[codecov]

Codecov Report

Merging #350 (d4e20ba) into main (aec31b1) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #350      +/-   ##
============================================
+ Coverage     91.41%   91.53%   +0.12%     
- Complexity      212      213       +1     
============================================
  Files            23       23              
  Lines           489      496       +7     
  Branches         31       32       +1     
============================================
+ Hits            447      454       +7     
  Misses           24       24              
  Partials         18       18              

Flag	Coverage Δ
unittests	91.53% <100.00%> (+0.12%)	⬆️

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Impacted Files	Coverage Δ
src/main/java/dev/openfeature/sdk/Value.java	92.04% <100.00%> (+0.68%)	⬆️

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[sonarqubecloud]

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication