Implement output buckets

[codedeliveryservice]

Elo   | 3.03 +- 2.46 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | 2.91 (-2.25, 2.89) [0.00, 5.00]
Games | N: 27152 W: 7242 L: 7005 D: 12905
Penta | [366, 3190, 6281, 3319, 420]

Elo   | 6.91 +- 4.56 (95%)
SPRT  | 20.0+0.20s Threads=1 Hash=128MB
LLR   | 2.90 (-2.25, 2.89) [0.00, 5.00]
Games | N: 7296 W: 1939 L: 1794 D: 3563
Penta | [59, 852, 1714, 931, 92]

Aligning NNUE parameters gives an extra ~2.8% speedup on top of the network test.