fix(tusb_cdc): Added freeing cdc object

[roma-jam]

Description

Common sequence for tinyusb CDC driver install:

1. tinyusb_driver_install()
2. tusb_cdc_acm_initialized()
3. tusb_cdc_acm_init()

During the tusb_cdc_acm_init() the internal object cdc_inst->subclass_obj is allocated.
And doesn't freeing during the common uninstall:

1. tusb_cdc_acm_deinit()
2. tinyusb_driver_uninstall()

Changes

• Implemented new static function: obj_free(itf), which is the freeing mechanism for function alloc_obj(itf)
• Added the obj_free(itf) call while tusb_cdc_acm_deinit()

And during these steps there is no freeing present.

Related

• Was found in feature(esp_tinyusb): Added tusb_teardown() call while tinyusb_driver_uninstall()  #39

Testing

• eps_tinyusb teardown PR: feature(esp_tinyusb): Added tusb_teardown() call while tinyusb_driver_uninstall()  #39

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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.

[peter-marcisovsky]

Good catch! LGTM

[roma-jam]

Added changes description in CHANGELOG.md