Add ELF (Easy Local Features) Extractor #482
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This PR introduces a new feature extractor class — ElfFeatures — integrating the easy_local_features
library into HLoc.
The extractor provides a flexible interface to ELF’s keypoint detectors and descriptors (e.g., XFeat, ALIKED, DISK, etc.), making it easier to experiment with recent local feature backbones under a unified API.