Upgrade OGNL to 3.4.7 and expand test coverage

[marevol]

Summary

• Upgrade OGNL dependency from 3.2.20 to 3.4.7
• Add @Test annotations to all existing test methods
• Add comprehensive tests for OGNL-specific features

Changes Made

• pom.xml: Bump ognl.version from 3.2.20 to 3.4.7
• OgnlEngineTest.java:
  • Add missing @Test annotations and org.junit.jupiter.api.Test import
  • Add tests for collection projection ({field}) and selection ({? condition}, {^ ...}, {$ ...})
  • Add tests for constructor invocation via OGNL
  • Add tests for static field access (@Class@FIELD) and static method calls (@Class@method())
  • Add tests for chained method calls
  • Add tests for type conversion and mixed-type arithmetic
  • Add tests for OGNL context variables (#this)
  • Add tests for comma (sequence) expressions
  • Add tests for in / not in operators
  • Add tests for assignment expressions
  • Add tests for list and map literals
  • Add tests for null value handling and null property access
  • Add tests for deeply nested expressions and large collection operations
  • Add tests for combined projection and selection
  • Add tests for bitwise operations (&, |, ^, <<, >>)

Testing

• All new tests validate OGNL expression evaluation through OgnlEngine.evaluate()
• Tests cover both positive cases and error/edge cases

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