Improve TypeScript escaping to handle control characters

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[augmentcode]

🤖 Augment PR Summary

Summary: This PR improves TypeScript string escaping so generated code can safely represent JSON Schema property names containing ASCII control characters.

Changes:

• Added explicit escaping for backspace (\b) and form feed (\f) in the TypeScript generator.
• Escapes remaining control characters below 0x20 using \uXXXX sequences.
• Added an end-to-end TypeScript test fixture covering control characters in property names (including NUL, SOH, and US).

Technical Notes: Uses <iomanip> stream formatting (std::hex/std::setw/std::setfill) to produce zero-padded 4-digit Unicode escapes.

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[augmentcode]

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