Fix template class/struct line formatting (Issue #68)

[konard]

Summary

• Fixes issue Place class/struct definition on the next line after template definition. #68 by placing class/struct definitions on the next line after template declarations
• Updates both C# and Python implementations for consistency
• Adds comprehensive test cases to prevent regressions

Changes

Before

template <typename TValue> struct ISetter<TValue>
{
    virtual void Set(TValue value) = 0;
    virtual ~ISetter<TValue>() = default;
};

After

template <typename TValue>
struct ISetter<TValue>
{
    virtual void Set(TValue value) = 0;
    virtual ~ISetter<TValue>() = default;
};

Implementation Details

• Modified regex patterns in both CSharpToCppTransformer.cs and cs2cpp.py
• Updated transformation rules for both struct/class and interface declarations
• Added Environment.NewLine in C# and \n in Python to separate template and class/struct lines
• Maintains existing functionality while improving code formatting

Test Plan

• Added TemplateLineBreakTest for struct template declarations
• Added InterfaceTemplateLineBreakTest for interface template declarations
• Verified existing tests continue to pass
• Tested regex patterns independently to ensure correct behavior

🤖 Generated with Claude Code

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Resolves #68