perf(python): improve performance of align_frames, and add new alignment option
#8899
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Closes #8896.
The newer (correct) strategy for aligning frames (which handles duplicate keys) had a bigger impact than expected when aligning a larger number of frames. This patch addresses that by...
howstrategy that can be faster than the original alignment code; if all frames can be aligned against the first frame, you can sethow="left"for a very significant speedup.