feat: add example tests for Theta, Bloom Filter, Count-Min, and Tuple…

[Fengzdadi]

Summary

Add example test files for 4 sketch types that were previously missing examples:

• Theta Sketch
• Bloom Filter
• Count-Min Sketch
• Tuple Sketch

Motivation

The examples/ directory had examples for some sketches (CPC, HLL, KLL, Frequency) but was missing examples for Theta, Bloom Filter, Count-Min, and Tuple Sketches. These examples help new users understand how to use these sketches.

Changes

File	Description
examples/theta_example_test.go	Demonstrates basic ops, Union, Intersection, A-not-B, serialization
examples/bloom_filter_example_test.go	Demonstrates membership testing, Union, serialization
examples/count_min_example_test.go	Demonstrates frequency estimation, merging, serialization
examples/tuple_example_test.go	Demonstrates custom Summary type, aggregation, Union/Intersection with Policy

Testing

All tests pass:

go test -v ./examples/

Checklist

• All example tests pass
• Follows existing code style (Apache license header, testify assertions)
• Each example demonstrates key features of its respective sketch

[freakyzoidberg]

Thank you !