Generate C/C++ headers in compile using --include (like xxd)

[jviotti]

Signed-off-by: Juan Cruz Viotti [email protected]

[augmentcode]

🤖 Augment PR Summary

Summary: Adds a new --include/-n mode to jsonschema compile to emit the compiled schema template as a C/C++ header (similar to xxd output).

Changes:

• Extends CLI/docs help for compile to advertise --include/-n <name>.
• Implements header generation in src/command_compile.cc, encoding the template JSON as "\\xNN" byte sequences with 16 bytes per line.
• Generates a header guard keyed by the provided name, plus NAME_DATA and NAME_LENGTH symbols.
• For C++ builds, additionally exposes a constexpr std::string_view NAME wrapper.
• Adds Unix test cases to validate output stability, short-option support, and that the generated header compiles under both C and C++.

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[augmentcode]

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