feat: add TypeScript type definitions for Soroban contract events

[susanyusuf]

closes #197

Description

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Fixes #(issue)

Type of Change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test coverage improvement

Changes Made

Testing

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• Test B
  Closes Enhance Soroban Client: Add Type Definitions for Contract Events #197
  Closes Enhance Soroban Client: Add Type Definitions for Contract Events #197

Checklist

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• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

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