Transform stages

Stage	Description
ZigzagStage	Zigzag encode/decode (signed <-> unsigned)
NegabinaryStage	Negabinary encode/decode (signed <-> unsigned)
ADMStage	Adaptive Data Mapping — remaps u16/u32 into compact 8-bit domain (MANS)
LogTransformStage	Log-space transform — converts a point-wise relative bound into an absolute one (Liang et al., CLUSTER'18)