[ENH] adtw memory and speed improvements

[TonyBagnall]

ADTW
closes #3262

Part of #3261 (memory optimization for elastic distances). Applies the two-row dynamic-programming optimization established for DTW in #3258 (and MSM in #3562) to ADTW.

more of the same

n	Runtime base → opt	Mem base → opt
1,000	9.6 → 6.2 ms (1.5×)	9.0 → 1.0 MB (9.0×)
4,000	0.25 → 0.12 s (2.1×)	144 → 16 MB (9.0×)
8,000	1.00 → 0.42 s (2.4×)	576 → 64 MB (9.0×)
16,000	not run → 1.63 s	~2.3 GB → 256 MB

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[TonyBagnall]