feat: Add Phase 1 languages (Bash, C, C++, C#, COBOL) to CodeLang

[kirit93]

Add support for five high-priority programming languages to Data Designer's code generation capabilities:

• Bash: Universal DevOps and automation scripting
• C, C++, C#: Systems programming and enterprise development
• COBOL: Legacy mainframe systems and modernization

These languages address critical enterprise use cases including legacy code maintenance, systems programming, and infrastructure automation.

Changes:

• Add new CodeLang enum values for bash, c, cpp, csharp, cobol
• Update code_lang_to_syntax_lexer() with Pygments lexer mappings
• Update documentation to reflect new supported languages
• Update tests to account for 21 total supported languages (up from 16)

[greptile-apps]

Greptile Overview

Greptile Summary

This PR successfully adds support for 5 new programming languages to DataDesigner's code generation capabilities: Bash, C, C++, C#, and COBOL.

Changes:

• Added 5 new CodeLang enum values in alphabetical order
• Updated code_lang_to_syntax_lexer() mapping with appropriate Pygments lexer names for the new languages
• Updated test count from 16 to 21 supported languages
• Updated documentation to accurately list all supported languages in alphabetical order

Implementation Quality:

• All changes follow the existing pattern and maintain alphabetical ordering
• Pygments lexers exist for all new languages (bash, c, cpp, csharp, cobol)
• Documentation and tests are properly synchronized with code changes
• The implementation is clean with no issues found

Confidence Score: 5/5

• This PR is safe to merge - it's a straightforward feature addition with proper test coverage
• All changes are minimal, well-structured, and follow existing patterns. The implementation correctly adds enum values, lexer mappings, and updates tests/docs accordingly. No logic errors or breaking changes.
• No files require special attention

Important Files Changed

Filename	Overview
packages/data-designer-config/src/data_designer/config/utils/code_lang.py	Added 5 new language enum values (bash, c, cobol, cpp, csharp) and their Pygments lexer mappings in alphabetical order
packages/data-designer-config/tests/config/utils/test_code_lang.py	Updated test to reflect 21 total supported languages (up from 16)
docs/concepts/columns.md	Updated documentation to list all 15 supported non-SQL languages in alphabetical order

Sequence Diagram

sequenceDiagram
    participant User
    participant ConfigBuilder
    participant CodeLang
    participant CodeResponseRecipe
    participant LLMResponseParser
    participant Pygments

    User->>ConfigBuilder: Create LLMCodeColumnConfig(code_lang="bash")
    ConfigBuilder->>CodeLang: Validate "bash" enum value
    CodeLang-->>ConfigBuilder: Valid CodeLang.BASH
    
    Note over ConfigBuilder: Configuration stored

    User->>ConfigBuilder: Generate dataset
    ConfigBuilder->>CodeResponseRecipe: Initialize with syntax="bash"
    CodeResponseRecipe->>CodeLang: parse_lang("bash")
    CodeLang-->>CodeResponseRecipe: "bash"
    
    CodeResponseRecipe->>CodeResponseRecipe: Set task_instructions with "bash"
    CodeResponseRecipe-->>ConfigBuilder: Ready for generation
    
    Note over ConfigBuilder,LLMResponseParser: LLM generates code response
    
    LLMResponseParser->>LLMResponseParser: Extract code from ```bash fence
    LLMResponseParser-->>ConfigBuilder: Parsed bash code
    
    opt Syntax Highlighting
        ConfigBuilder->>CodeLang: code_lang_to_syntax_lexer(CodeLang.BASH)
        CodeLang-->>ConfigBuilder: "bash"
        ConfigBuilder->>Pygments: get_lexer_by_name("bash")
        Pygments-->>ConfigBuilder: BashLexer instance
    end

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