feat(profiler): add multithreading support and testcase

[FASTSHIFT]

Description of the feature or fix

1. Transfer the lv_profiler_builtin_ctx_t structure to private.
2. Add multithreading support.
3. Refine testcase.

Notes

• Update the Documentation if needed.
• Add Examples if relevant.
• Add Tests if applicable.
• If you added new options to lv_conf_template.h run lv_conf_internal_gen.py and update Kconfig.
• Run scripts/code-format.py (astyle needs to be installed) and follow the Code Conventions
• Mark the Pull request as Draft while you are working on the first version, and mark is as Ready when it's ready for review.
• When changes were requested, re-request review to notify the maintainers.
• Help us to review this Pull Request! Anyone can approve or request changes.

[FASTSHIFT]

The effect looks good.

Import this file multi-thread trace.txt into perfetto to display it.