Update generator_callbacks scripts to handle individual modules

[seungsoo47]

• Modify generate_callbacks.sh to process individual ffigen_*.yaml configs.
• Replace line-based parsing with regex to correctly handle multi-line typedef declarations.
• Add missing callback functions.

[gemini-code-assist]

Code Review

This pull request updates the callback generator to support multiple ffigen configurations per Tizen version and improves the robustness of the parsing logic. Key changes include adding bounds checks in the comment reader, switching to regex-based typedef extraction, and modifying header discovery to include all headers in a directory when a match is found. Feedback was provided to improve the typedef regex to handle indentation, ensure UTF-8 encoding when reading files, use warnings for unsupported patterns, and utilize Bash arrays for command arguments to safely handle paths with spaces.