Describe the PR

• relax hid host enumeration, allow set protocol to be stalled
• add note for blocking tuh_configuration_set(), tuh_interface_set()
• change meaning of CFG_TUH_HID to total number of HID interfaces supported. Previously CFG_TUH_HID is max number of interfaces per device which is rather limited and consume more resources than needed.
• fine tune CFG_TUH_HID value to 3*max_device (previously must be 4*dev and yet couldn't support 1 device with 5 interfaces while other left unused)
• change hid host instance in API to index
• add tuh_task_event_ready(), better implement blocking control transfer for rtos
• add tuh_hid_itf_get_info() and change tuh_cdc_itf_get_info() to use new tuh_itf_info_t