selftests/hid: add tests for hid_hw_raw_request HID-BPF hooks

selftests/hid: add tests for hid_hw_raw_request HID-BPF hooks

We add 3 new tests:
- first, we make sure we can prevent the raw_request to happen
- second, we make sure that we can detect that a given hidraw client
  was actually doing the request, and for that client only, call ourself
  hid_bpf_hw_request(), returning a custom value
- last, we ensure that we can not loop between hooks for
  hid_hw_raw_request() and manual calls to hid_bpf_hw_request() from that
  hook

Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-6-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>