Added example for HOG composite device

[benjaminaigner]

This PR adds an example for HOG composite devices:

• mouse
• keyboard
• joystick
• consumer control

All of them are tested on Android, Linux and Win10

Notes:

• this PR does not include the changes in hid_device.c as described here:
  HOG - ATT DB / hids_device_t  #483 (comment)

• Currently this example is only included in the libusb port Makefile, if you want to compile it for another platform either use CMake or adapt the Makefile.

[karugaru]

+1

This is an excellent example.
If this example had been included in the repository, I wouldn't have struggled.

btstack includes importing and using hids.gatt as a standard example.
However, when multiple HID input reports exist, users must write their own definitions.

Specifically, since this is more of a btstack-specific issue than a BLE problem, users might never realize it without such an example.

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