feat(usb_host): CDC-ACM Host add suspend/resume events

[peter-marcisovsky]

Description

This MR adds Suspend/Resume events for CDC-ACM class driver as a follow-up for the Global/Suspend resume feature in the usb component.

Added a backward compatibility for older IDF releases, where the suspend/resume will not be backported, by:

// For backward compatibility with IDF versions which do not have suspend/resume api
#ifdef USB_HOST_LIB_EVENT_FLAGS_AUTO_SUSPEND
#define CDC_HOST_SUSPEND_RESUME_API_SUPPORTED
#endif

Related

• Suspend/Resume support for CDC Class driver

Testing

• Added tests, which verify the class driver functionality with root port Suspend/Resume events

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

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Note

Add suspend/resume event handling to CDC-ACM host with backward-compatible API guards and comprehensive test coverage.

• CDC-ACM Host (core/driver):
  • Handle USB_HOST_CLIENT_EVENT_DEV_SUSPENDED/DEV_RESUMED; emit CDC_ACM_HOST_DEVICE_SUSPENDED/CDC_ACM_HOST_DEVICE_RESUMED to clients.
  • Add cdc_acm_resume() to re-submit BULK IN and INTR IN polls after resume.
  • Integrate backward-compat macro CDC_HOST_SUSPEND_RESUME_API_SUPPORTED (gated by USB_HOST_LIB_EVENT_FLAGS_AUTO_SUSPEND).
  • Minor robustness/logging tweaks in USB event handling.
• Public API/Headers:
  • Extend cdc_acm_host_dev_event_t with suspend/resume events; include usb/usb_host.h.
  • Add compat macro in public headers; update SPDX years.
• Tests:
  • Add suspend/resume scenarios: multiple pseudo-devs, auto PM timer (one-shot/periodic), sudden disconnect while suspended, open/close while suspended, auto-suspend under multi-thread load, resume by transfer submission.
  • Introduce app_queue helpers (wait_for_app_event, wait_for_no_app_event); refactor to a default device config; host loop reacts to USB_HOST_LIB_EVENT_FLAGS_AUTO_SUSPEND.
• Docs:
  • Update CHANGELOG.md with "Added global suspend/resume support".

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