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f78543ee75
Refactor k-mer index building to use the new disk-based KmerSetGroupBuilder instead of the old KmerSet and FrequencyFilter approaches. This change introduces a more efficient and scalable approach to building k-mer indices by using partitioned disk storage with streaming operations. - Replace BuildKmerIndex and BuildFrequencyFilterIndex with KmerSetGroupBuilder - Add support for frequency filtering via WithMinFrequency option - Remove deprecated k-mer set persistence methods - Update CLI to use new builder approach - Add new disk-based k-mer operations (union, intersect, difference, quorum) - Introduce KDI (K-mer Delta Index) file format for efficient storage - Add K-way merge operations for combining sorted k-mer streams - Update documentation and examples to reflect new API This refactoring provides better memory usage, faster operations on large datasets, and more flexible k-mer set operations.