feat(pthread): Pthread can now use PSRAM as stack

Closes https://github.com/espressif/esp-idf/pull/10623
Closes https://github.com/espressif/esp-idf/issues/8662

Thanks to f-hoepfinger-hr-agrartechnik for the contribution
in https://github.com/espressif/esp-idf/pull/10623

docs/en/api-reference/system/pthread.rst

@@ -188,6 +188,7 @@ The API :cpp:func:`esp_pthread_set_cfg` defined in the ``esp_pthreads.h`` header
 
 .. list::
     - Default stack size of new threads, if not specified when calling ``pthread_create()`` (overrides :ref:`CONFIG_PTHREAD_TASK_STACK_SIZE_DEFAULT`).
+    - Stack memory capabilities: They determine which kind of memory is used for allocating pthread stacks. The field takes ESP-IDF heap capability flags, as defined in :component_file:`heap/include/esp_heap_caps.h`. The memory must be 8-bit accessible (MALLOC_CAP_8BIT), besides other custom flags the user can choose from. The user is responsible for ensuring the correctness of the stack memory capabilities. For more information about memory locations, refer to the documentation of :ref:`Memory Capabilities <memory_capabilities>`
     - RTOS priority of new threads (overrides :ref:`CONFIG_PTHREAD_TASK_PRIO_DEFAULT`).
     :SOC_HP_CPU_HAS_MULTIPLE_CORES: - Core affinity / core pinning of new threads (overrides :ref:`CONFIG_PTHREAD_TASK_CORE_DEFAULT`).
     - FreeRTOS task name for new threads (overrides :ref:`CONFIG_PTHREAD_TASK_NAME_DEFAULT`)