Add support for the Thrustmaster T-GT II

[ranjian0]

The T-GT II currently gets handled as a T300RS, since both wheels share the
USB product ID 044f:b66d. This PR adds a T-GT II code path behind the
tgt2_force=1 module parameter and leaves the default T300RS behaviour
untouched.

What the T-GT II path does:

• Reuses the T300RS force feedback API unchanged (same FFB protocol).
• Replaces the fixed report descriptor with one matching the wheel's actual
  64-byte input report, which exposes inputs the T300RS descriptor drops:
  • two analog ministicks,
  • analog L2/R2 trigger pressure,
  • the 16-bit wheel and pedal axes with the correct T-GT II pedal order
    (the T300RS descriptor maps the T-GT II's clutch and throttle swapped).
• Parses the four endless rotary encoders (7-bit wrapping position counters,
  push flag in bit 7) in a new raw_event callback and exposes them as
  buttons: per dial, push + clockwise turn + counter-clockwise turn
  (BTN_TRIGGER_HAPPY1-12). Detent turns are reported as short button holds
  so polling userspace can see them.

Tested on a T-GT II on kernel 7.0: all buttons, dials, sticks and axes work,
and force feedback is unchanged compared to the T300RS path.

Fixes #151