esp_hid: make stack size adjustable using Kconfig (IDFGH-3889)

[v1993]

This allows users to specify stack size for HID application callbacks. Default value is based on one that previously was hardcoded.

Note: it is possible that default value is too small for esp_hid_host example. I can't test it right now, but it is worth double checking.

[me-no-dev]

Could you please change it to HID_EVENT_TASK_STACK_SIZE?

[v1993]

@me-no-dev No problem, but FYI I've based this naming off Bluetooth's BT_BTC_TASK_STACK_SIZE option.

[me-no-dev]

Thanks @v1993 :)

[igrr]

@v1993 sorry that it took so long to handle this. We have merged #6385 which is very similar to your change, but makes run-time configuration of the stack size possible, rather than keeping it compile-time only. It also fixes the "default value too small" issue you have mentioned.