🔍 TT Buckets, using unsafe struct with three explicit TTElements

[eduherminio]

Test  | tt/buckets-2-explicitstruct-32
Elo   | -7.53 +- 5.27 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=2MB
LLR   | -2.27 (-2.25, 2.89) [0.00, 3.00]
Games | 6918: +1844 -1994 =3080
Penta | [152, 913, 1465, 791, 138]
https://openbench.lynx-chess.com/test/2110/