Add C# language with tests

[Copilot]

• Create C# code generator (csharp_gen.py)
• Create C# frame parser generator (frame_parser_csharp_gen.py)
• Add multi-file generation support for C# frame parsers
• Update generate_boilerplate.py to include C# boilerplate generation
• Generate C# frame parser boilerplate files (BasicDefault, TinyDefault, etc.)
• Add FrameBase.cs with base utilities (FrameParseResult, FrameFormatBase, StructHelper)
• Add FrameParsers.cs with FrameFormatType enum
• Fix LengthBytes reference for frame parsers without length field (FrameFormatConfig, etc.)
• Verify code generation tests pass

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add C# language with tests</issue_title>
<issue_description>To implement this is C# the MarshalAs function can be used. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add C# language with tests #30

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[rijesha]

@copilot the c# tests are not running for the frame tests.
Generate the boilerplate code.

[Copilot]

@copilot the c# tests are not running for the frame tests.
Generate the boilerplate code.

Generated the C# frame parser boilerplate code in commit f3a0120. The boilerplate now includes all frame format parsers (BasicDefault, BasicMinimal, TinyDefault, TinyMinimal, etc.) in src/struct_frame/boilerplate/csharp/. Each frame parser class inherits from FrameFormatBase and provides Encode(), ParseByte(), ValidatePacket(), and Reset() methods.