Add support for listing tasks to gdb in gdbstub
Add support for listing tasks to gdb in gdbstub

…and changing the active task and fetching each task's stack

Merges https://github.com/espressif/esp-idf/pull/2828

espressif/esp-idf,espressif/esp-idf,espressif/esp-idf,espressif/esp-idf