hids_client: fix read HID descriptor

hids_client: put external characteristics in a separate array

hids_client: add test support

hids_client: merge states for boot and report mode

hids_client: store HID descriptor

hids_client: parse all EXTERNAL_REPORT_REFERENCE descriptors

hids_client: rename states, fix external report search

hids_client: refactor querying report map and report characteristics

hids_client: rename variable

hids_client: get HID Descriptor and External Report Reference from Report Map Characteristic

hids_client: get report ID from external report reference

hids_client: fix get next report index

hids_client: store boot input characteristics mapping into reports array

hids_client: check report type in report lookup

hids_client: implement hids_client_send_report

hids_client: fix enable mouse and keyboard

hids_client: emit report event, add example

hids_client: boot mode, handle connect

hids_client: skeleton code for connect

hids_client: move to gatt_service