feat: add tuple theta implementation and tests based on raw hashtable#147
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Summary
Implement the Tuple sketch behind a new
tuplefeature (built on top oftheta). A Tuple sketch extends the Theta sketch by attaching a user-defined summary to every retained key, merging summaries on duplicate keys and during set operations.Summary behavior is injected externally via policies (C++-style) rather than baked into the type.
Note
This implementation is highly inspired by the C++ version.