gptimer_set_raw_count() function

- ESP_OK: Set GPTimer raw count value successfully - ESP_ERR_INVALID_ARG: Set GPTimer raw count value failed because of invalid argument - ESP_FAIL: Set GPTimer raw count value failed because of other error

When updating the raw count of an active timer, the timer will immediately start counting from the new value. This function is allowed to run within ISR context If `CONFIG_GPTIMER_CTRL_FUNC_IN_IRAM` is enabled, this function will be placed in the IRAM by linker, makes it possible to execute even when the Flash Cache is disabled.